Maths
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English Language
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Responding to change (a2 only)
Infection and response
Homeostasis and response
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Cell biology
Organisms respond to changes in their internal and external environments (a-level only)
Biological molecules
Organisation
Substance exchange
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Inheritance, variation and evolution
Genetics & ecosystems (a2 only)
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1l the quest for political stability: germany, 1871-1991
Britain & the wider world: 1745 -1901
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
Geography
29 Nov 2025
108
2 pages
Bethany Cook @bethanycook_ocxl
Ever wondered why some volcanoes explode violently whilst others just quietly ooze lava? Understanding the different types of... Show more
Shield volcanoes are the gentle giants of the volcanic world. They've got slopes less than 10 degrees - imagine a warrior's shield lying flat on the ground. These volcanoes are made entirely of basaltic lava that's really hot and flows easily because it's low in silica.
The key thing about shield volcanoes is that they're not dramatic at all. The low viscosity magma flows smoothly down the gentle slopes, building up the volcano bit by bit. You won't find much explosive material here - eruptions are quiet, frequent, and produce loads of fluid lava through fissure eruptions on the sides.
Composite volcanoes are completely different beasts. They're tall, steep-sided cones made of alternating layers of lava and ash - like a geological layer cake. The magma here is andesitic with medium viscosity, so it doesn't flow far from the base.
Quick Tip Remember that composite volcanoes are found at convergent margins where oceanic crust gets pushed under continental crust - think Mt. St. Helens!
These volcanoes are proper explosive. Higher gas content means pyroclastic flows and much more dangerous eruptions that can last ages.
When volcanoes go completely mental, they can form calderas - massive circular craters up to 20km wide. This happens in three dramatic stages violent eruptions empty the magma chamber, the top starts collapsing into the weakened space below, then the entire cone collapses. If it's near the coast, this can trigger tsunamis.
Volcanic eruptions happen when magma (molten rock from the Earth's mantle) rises to the surface because it's less dense than surrounding rock. As it rises, gas bubbles form inside it, and it searches for weak spots in the Earth's crust to break through.
Here's where it gets interesting low viscosity magma flows out calmly as lava. But thick, high viscosity magma traps those gas bubbles, building up massive pressure until - BOOM! - you get an explosive eruption.
Remember Viscosity is everything! Thick magma = explosive eruptions with pyroclastic flows, ash clouds, and volcanic bombs. Thin magma = gentle lava flows.
The nastiest eruptions produce pyroclastic flows , ash clouds that travel for kilometres, and volcanic bombs - basically massive chunks of hot rock flying through the air.
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.
3
Smart Tools NEW
Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Mock Exam ✓ Essay Outlines
Explore key concepts of tectonic plate boundaries and volcanic activity, including types of volcanoes, eruption styles, and associated hazards. This comprehensive summary is ideal for A-Level Geography students seeking to understand the dynamics of Earth's geology.
GeographyExplore in-depth case studies of the 2010 Haiti earthquake and the 2011 Japan earthquake and tsunami. This resource covers key characteristics, impacts, and responses, focusing on social, economic, and environmental aspects. Ideal for A Level Geography students studying natural hazards and disaster management.
GeographyExplore in-depth case studies of tectonic hazards and processes relevant to A Level Geography. This resource covers key concepts such as earthquake dynamics, volcanic activity, and their impacts on human and physical environments. Ideal for Edexcel students preparing for exams.
GeographyExplore key case studies on natural hazards, including the 2010 Haiti earthquake, Japan's earthquake preparedness, and the impact of the Christchurch earthquake. This resource covers the causes, responses, and recovery efforts related to significant seismic events and volcanic eruptions, providing essential insights for A Level OCR Geography students.
GeographyExplore the dynamics of tectonic plates, including oceanic and continental crust, and their role in earthquakes and volcanoes. This summary covers constructive, destructive, and conservative plate margins, highlighting the global distribution of tectonic hazards and processes.
GeographyExplore the complexities of natural hazards in this comprehensive study note. Covering key topics such as tectonic hazards, volcanic activity, tropical storms, and case studies like Typhoon Haiyan and the Haiti earthquake, this resource provides essential insights into risk management and the impacts of disasters. Ideal for A Level Geography students seeking to deepen their understanding of environmental dynamics and hazard responses.
GeographyApp 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
Bethany Cook
@bethanycook_ocxl
Ever wondered why some volcanoes explode violently whilst others just quietly ooze lava? Understanding the different types of volcanoes and how they work is crucial for your geography studies - and it's actually quite fascinating once you get the hang... Show more
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Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Shield volcanoes are the gentle giants of the volcanic world. They've got slopes less than 10 degrees - imagine a warrior's shield lying flat on the ground. These volcanoes are made entirely of basaltic lava that's really hot and flows easily because it's low in silica.
The key thing about shield volcanoes is that they're not dramatic at all. The low viscosity magma flows smoothly down the gentle slopes, building up the volcano bit by bit. You won't find much explosive material here - eruptions are quiet, frequent, and produce loads of fluid lava through fissure eruptions on the sides.
Composite volcanoes are completely different beasts. They're tall, steep-sided cones made of alternating layers of lava and ash - like a geological layer cake. The magma here is andesitic with medium viscosity, so it doesn't flow far from the base.
Quick Tip: Remember that composite volcanoes are found at convergent margins where oceanic crust gets pushed under continental crust - think Mt. St. Helens!
These volcanoes are proper explosive. Higher gas content means pyroclastic flows and much more dangerous eruptions that can last ages.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
When volcanoes go completely mental, they can form calderas - massive circular craters up to 20km wide. This happens in three dramatic stages: violent eruptions empty the magma chamber, the top starts collapsing into the weakened space below, then the entire cone collapses. If it's near the coast, this can trigger tsunamis.
Volcanic eruptions happen when magma (molten rock from the Earth's mantle) rises to the surface because it's less dense than surrounding rock. As it rises, gas bubbles form inside it, and it searches for weak spots in the Earth's crust to break through.
Here's where it gets interesting: low viscosity magma flows out calmly as lava. But thick, high viscosity magma traps those gas bubbles, building up massive pressure until - BOOM! - you get an explosive eruption.
Remember: Viscosity is everything! Thick magma = explosive eruptions with pyroclastic flows, ash clouds, and volcanic bombs. Thin magma = gentle lava flows.
The nastiest eruptions produce pyroclastic flows , ash clouds that travel for kilometres, and volcanic bombs - basically massive chunks of hot rock flying through the air.
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.
3
Smart Tools NEW
Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Mock Exam ✓ Essay Outlines
Explore key concepts of tectonic plate boundaries and volcanic activity, including types of volcanoes, eruption styles, and associated hazards. This comprehensive summary is ideal for A-Level Geography students seeking to understand the dynamics of Earth's geology.
GeographyExplore in-depth case studies of the 2010 Haiti earthquake and the 2011 Japan earthquake and tsunami. This resource covers key characteristics, impacts, and responses, focusing on social, economic, and environmental aspects. Ideal for A Level Geography students studying natural hazards and disaster management.
GeographyExplore in-depth case studies of tectonic hazards and processes relevant to A Level Geography. This resource covers key concepts such as earthquake dynamics, volcanic activity, and their impacts on human and physical environments. Ideal for Edexcel students preparing for exams.
GeographyExplore key case studies on natural hazards, including the 2010 Haiti earthquake, Japan's earthquake preparedness, and the impact of the Christchurch earthquake. This resource covers the causes, responses, and recovery efforts related to significant seismic events and volcanic eruptions, providing essential insights for A Level OCR Geography students.
GeographyExplore the dynamics of tectonic plates, including oceanic and continental crust, and their role in earthquakes and volcanoes. This summary covers constructive, destructive, and conservative plate margins, highlighting the global distribution of tectonic hazards and processes.
GeographyExplore the complexities of natural hazards in this comprehensive study note. Covering key topics such as tectonic hazards, volcanic activity, tropical storms, and case studies like Typhoon Haiyan and the Haiti earthquake, this resource provides essential insights into risk management and the impacts of disasters. Ideal for A Level Geography students seeking to deepen their understanding of environmental dynamics and hazard responses.
GeographyApp 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
