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Changing Urban Environments
The Living World
Globalisation (Year 10)
Exams and Revsion
9B Energy task
Yr10 Amazon Deforestation
Taking GCSE Geography
Rivers (Year 10)
RE - Why is the earth's crust unstable
The structure of the earth
Inside the earth it's hot - really hot. We know that becasue of the molten lava that spews from volcanoes. Also, in some places, you get hot springs and geysers. The earth isn't a solid bal of rock. It's made up of different layers like an apple. The skin/peel is the crust, the white fleshy part the mantle and where the seeds are the core.
The earth's crust is divided into large pieces, called plates. It's unstable because these plates move very slowly. The different plates meets at plate margins, or boundaries. There are four main types of plate margins:
Constructive - where the plates are moving apart
Conservative - where the plates slide past each other
Collision - where the plates push against each other often forming mountains - Himalayas
Destructive - where the plates collide
Excellent Animations -
Structure of the earth
Why do the plates move?
Types of crust
The Earth's crust is made up of:
Oceanic crust - is found under the ocean
Continental crust - is found underneath the continents or land masses
Sinks into the mantle when oceanic and
continental crust meet
The oldest is only 180 million years old
Very old - 3-4 billion years old
Forms constantly at constructive plate margins
New crust isn't formed
Destroyed at destructive plate margins
Cannot be destroyed
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