Cities around the world face similar challenges - from bustling... Show more
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Responding to change (a2 only)
Infection and response
Homeostasis and response
Energy transfers (a2 only)
Cell biology
Organisms respond to changes in their internal and external environments (a-level only)
Biological molecules
Organisation
Substance exchange
Bioenergetics
Genetic information & variation
Inheritance, variation and evolution
Genetics & ecosystems (a2 only)
Ecology
Cells
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Britain & the wider world: 1745 -1901
1l the quest for political stability: germany, 1871-1991
The cold war
Inter-war germany
Medieval period: 1066 -1509
2d religious conflict and the church in england, c1529-c1570
2o democracy and nazism: germany, 1918-1945
1f industrialisation and the people: britain, c1783-1885
1c the tudors: england, 1485-1603
2m wars and welfare: britain in transition, 1906-1957
World war two & the holocaust
2n revolution and dictatorship: russia, 1917-1953
2s the making of modern britain, 1951-2007
World war one
Britain: 1509 -1745
Show all topics
102
•
3 Dec 2025
•
Isla
@isla_glover
Cities around the world face similar challenges - from bustling... Show more







You're about to explore how cities work and change over time. Urban geography helps explain why certain areas develop the way they do and how planners try to solve urban problems.
Cities have distinct zones - each with their own characteristics and challenges. Understanding these patterns will help you recognise similar features in any city you visit.

Edinburgh's CBD perfectly shows what makes city centres tick. The most obvious feature? Historic churches dominating the skyline because CBDs grew from the oldest parts of towns.
Transport hubs like Waverley Station make CBDs incredibly accessible - perfect for business and tourism. That's why you'll find information centres helping tourists navigate attractions like Dynamic Earth, plus high-order shops that can afford the premium locations.
Space is absolutely precious in CBDs, so buildings grow upwards rather than outwards. Only wealthy businesses like banks can afford the sky-high rent prices, which explains why CBDs are packed with financial companies.
Quick Tip: CBDs are expensive because everyone wants to be there - it's supply and demand in action!
Edinburgh's CBD keeps evolving with new developments like the EICC and Sheraton Hotel creating jobs, whilst Holyrood Parliament reinforces the city's political importance. Pedestrianised areas like Rose Street make shopping safer, and multi-storey car parks help manage the constant flow of visitors.

Edinburgh's inner city tells the story of industrial Britain. The grid iron street pattern maximises limited space, whilst tenement and terraced housing provided affordable homes for factory workers who couldn't afford larger properties.
Location was everything - inner cities developed near water sources for cooling factory machinery and alongside canals or railways for easy transport of goods. Unfortunately, this industrial legacy left areas with elevated pollution levels and poor sanitation.
Shared toilets in cramped tenement flats weren't just inconvenient - they were genuinely unsanitary when dozens of families used the same facilities.
Remember: Inner cities weren't designed to be unpleasant - they developed this way because of industrial needs and economic constraints.
Modern regeneration projects are transforming these areas dramatically. The Water of Leith basin now features upmarket restaurants, whilst Victoria Quay houses Scottish government offices providing 1,600 jobs. Luxury flats and facilities like Ocean Terminal shopping centre attract new residents and investment to previously neglected areas.

Traffic congestion in developed cities has exploded - British roads carried 10 times more traffic in 2006 than 1950. More car ownership, delivery lorries, and suburban commuting create chaos on roads that were never designed for modern vehicles.
Edinburgh tackles these challenges through smart transport planning. Greenways (dedicated bus lanes) speed up public transport on key routes like Lothian Road, whilst a £100 million bus upgrade programme makes public transport more attractive.
The city bypass lets long-distance traffic avoid the centre entirely, and one-way systems improve traffic flow through busy areas. Park and ride schemes encourage drivers to leave cars on the city outskirts and use public transport for the final journey.
Think About It: Every car switched to public transport means less congestion for everyone else!
Trams represent the latest solution - each tram carries the equivalent of three buses worth of passengers whilst reducing both air and noise pollution in the city centre.

Rio's favelas show how rapid urbanisation creates massive challenges. Narrow streets can't accommodate basic services like bin lorries, whilst poor construction using bricks and mud creates unsafe housing with no proper planning regulations.
Limited education leads to high unemployment because residents lack essential skills. This creates a cycle where high crime rates develop as young people turn to gangs for income and identity.
Poor sanitation becomes deadly serious when drainage fails and multiple families share toilets - diseases like cholera spread rapidly in these conditions. Many favelas face mudslide risks because they're built on unstable hillsides where land is cheap.
Key Point: Shanty towns aren't just about poverty - they're about lack of infrastructure and planning.
These settlements often house millions of people who've moved to cities seeking better opportunities but can't afford formal housing.

Rio uses various approaches to improve favela conditions, each with trade-offs. Pacification campaigns send police to remove drug dealers and gangs, creating safer environments - but criminals often return when police leave.
Non-governmental organisations provide education and skills training, giving residents genuine opportunities for better employment. However, these programmes depend entirely on donations, making them unreliable.
Self-help schemes supply building materials so residents can improve their own homes and learn construction skills. Unfortunately, some people take more materials than they need, reducing programme effectiveness.
Reality Check: There's no perfect solution - each approach has benefits and limitations.
Project Cingapura replaces shanty areas with tower blocks offering better sanitation and safety. The major problem? Most residents can't afford the rent for these improved apartments.
Site and service schemes install basic infrastructure like street lighting and medical facilities. Whilst this improves living conditions significantly, residents often lack the skills to fully benefit from these improvements.
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
App Store
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
Isla
@isla_glover
Cities around the world face similar challenges - from bustling business districts to overcrowded housing areas and traffic jams. By looking at how places like Edinburgh and Rio de Janeiro have developed and changed, you'll understand the patterns that shape... Show more

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Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
You're about to explore how cities work and change over time. Urban geography helps explain why certain areas develop the way they do and how planners try to solve urban problems.
Cities have distinct zones - each with their own characteristics and challenges. Understanding these patterns will help you recognise similar features in any city you visit.

Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Edinburgh's CBD perfectly shows what makes city centres tick. The most obvious feature? Historic churches dominating the skyline because CBDs grew from the oldest parts of towns.
Transport hubs like Waverley Station make CBDs incredibly accessible - perfect for business and tourism. That's why you'll find information centres helping tourists navigate attractions like Dynamic Earth, plus high-order shops that can afford the premium locations.
Space is absolutely precious in CBDs, so buildings grow upwards rather than outwards. Only wealthy businesses like banks can afford the sky-high rent prices, which explains why CBDs are packed with financial companies.
Quick Tip: CBDs are expensive because everyone wants to be there - it's supply and demand in action!
Edinburgh's CBD keeps evolving with new developments like the EICC and Sheraton Hotel creating jobs, whilst Holyrood Parliament reinforces the city's political importance. Pedestrianised areas like Rose Street make shopping safer, and multi-storey car parks help manage the constant flow of visitors.

Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Edinburgh's inner city tells the story of industrial Britain. The grid iron street pattern maximises limited space, whilst tenement and terraced housing provided affordable homes for factory workers who couldn't afford larger properties.
Location was everything - inner cities developed near water sources for cooling factory machinery and alongside canals or railways for easy transport of goods. Unfortunately, this industrial legacy left areas with elevated pollution levels and poor sanitation.
Shared toilets in cramped tenement flats weren't just inconvenient - they were genuinely unsanitary when dozens of families used the same facilities.
Remember: Inner cities weren't designed to be unpleasant - they developed this way because of industrial needs and economic constraints.
Modern regeneration projects are transforming these areas dramatically. The Water of Leith basin now features upmarket restaurants, whilst Victoria Quay houses Scottish government offices providing 1,600 jobs. Luxury flats and facilities like Ocean Terminal shopping centre attract new residents and investment to previously neglected areas.

Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Traffic congestion in developed cities has exploded - British roads carried 10 times more traffic in 2006 than 1950. More car ownership, delivery lorries, and suburban commuting create chaos on roads that were never designed for modern vehicles.
Edinburgh tackles these challenges through smart transport planning. Greenways (dedicated bus lanes) speed up public transport on key routes like Lothian Road, whilst a £100 million bus upgrade programme makes public transport more attractive.
The city bypass lets long-distance traffic avoid the centre entirely, and one-way systems improve traffic flow through busy areas. Park and ride schemes encourage drivers to leave cars on the city outskirts and use public transport for the final journey.
Think About It: Every car switched to public transport means less congestion for everyone else!
Trams represent the latest solution - each tram carries the equivalent of three buses worth of passengers whilst reducing both air and noise pollution in the city centre.

Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Rio's favelas show how rapid urbanisation creates massive challenges. Narrow streets can't accommodate basic services like bin lorries, whilst poor construction using bricks and mud creates unsafe housing with no proper planning regulations.
Limited education leads to high unemployment because residents lack essential skills. This creates a cycle where high crime rates develop as young people turn to gangs for income and identity.
Poor sanitation becomes deadly serious when drainage fails and multiple families share toilets - diseases like cholera spread rapidly in these conditions. Many favelas face mudslide risks because they're built on unstable hillsides where land is cheap.
Key Point: Shanty towns aren't just about poverty - they're about lack of infrastructure and planning.
These settlements often house millions of people who've moved to cities seeking better opportunities but can't afford formal housing.

Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Rio uses various approaches to improve favela conditions, each with trade-offs. Pacification campaigns send police to remove drug dealers and gangs, creating safer environments - but criminals often return when police leave.
Non-governmental organisations provide education and skills training, giving residents genuine opportunities for better employment. However, these programmes depend entirely on donations, making them unreliable.
Self-help schemes supply building materials so residents can improve their own homes and learn construction skills. Unfortunately, some people take more materials than they need, reducing programme effectiveness.
Reality Check: There's no perfect solution - each approach has benefits and limitations.
Project Cingapura replaces shanty areas with tower blocks offering better sanitation and safety. The major problem? Most residents can't afford the rent for these improved apartments.
Site and service schemes install basic infrastructure like street lighting and medical facilities. Whilst this improves living conditions significantly, residents often lack the skills to fully benefit from these improvements.
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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App Store
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user