Ever wondered why earthquakes shake California whilst volcanoes erupt in...
Geography640 views·Updated 7 Aug 2026·2 pagesUnderstanding Earth: Tectonic Hazards and Plate Margins - GCSE Geography
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1
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Earth's Structure
Think of the Earth like a giant layered cake, with each layer having completely different properties. The crust is where we live - it's the thin outer shell that's broken into enormous puzzle pieces called tectonic plates.
There are two types of crust you need to know about. Continental crust sits under the land, it's thick and ancient. Oceanic crust lies beneath the oceans and is much thinner, younger, but crucially much denser than continental crust.
Below the crust lies the mantle, a layer of molten rock called magma that's constantly moving about. Deeper still, you'll find the outer core (liquid metal) and the inner core (solid metal and the hottest part of Earth).
Key Point: Earthquakes happen at all four types of plate boundaries, but volcanoes only occur where plates are moving apart or colliding in specific ways.
2
of 2
Plate Boundaries and Their Hazards
Destructive boundaries are where the real drama happens. At subduction zones like the Andes, oceanic plates crash into continental plates. Because oceanic crust is denser, it gets forced underneath, melts, and creates magma that erupts as volcanoes.
When two continental plates collide (like in the Himalayas), neither can sink, so the land gets crushed upwards into massive fold mountains. You get earthquakes here but no volcanoes.
Constructive boundaries work the opposite way - plates pull apart (like at the Mid-Atlantic Ridge), allowing magma to rise and form new volcanoes. Conservative boundaries are where plates simply slide past each other, like California's San Andreas Fault.
Remember: The type of boundary determines what hazards you'll get - it's all about the direction plates are moving and what type of crust is involved.
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Geography640 views·Updated 7 Aug 2026·2 pagesUnderstanding Earth: Tectonic Hazards and Plate Margins - GCSE Geography
ellie@ellili.7
Ever wondered why earthquakes shake California whilst volcanoes erupt in Iceland? It's all down to massive rocky plates beneath our feet that are constantly moving around. Understanding these tectonic platesand how they behave is crucial for explaining some of...
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Earth's Structure
Think of the Earth like a giant layered cake, with each layer having completely different properties. The crust is where we live - it's the thin outer shell that's broken into enormous puzzle pieces called tectonic plates.
There are two types of crust you need to know about. Continental crust sits under the land, it's thick and ancient. Oceanic crust lies beneath the oceans and is much thinner, younger, but crucially much denser than continental crust.
Below the crust lies the mantle, a layer of molten rock called magma that's constantly moving about. Deeper still, you'll find the outer core (liquid metal) and the inner core (solid metal and the hottest part of Earth).
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2
of 2Sign up to see the content. It's free!
- Access to all documents
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Plate Boundaries and Their Hazards
Destructive boundaries are where the real drama happens. At subduction zones like the Andes, oceanic plates crash into continental plates. Because oceanic crust is denser, it gets forced underneath, melts, and creates magma that erupts as volcanoes.
When two continental plates collide (like in the Himalayas), neither can sink, so the land gets crushed upwards into massive fold mountains. You get earthquakes here but no volcanoes.
Constructive boundaries work the opposite way - plates pull apart (like at the Mid-Atlantic Ridge), allowing magma to rise and form new volcanoes. Conservative boundaries are where plates simply slide past each other, like California's San Andreas Fault.
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