The Structure Of The Earth Flashcards Preview

Geography Unit 1 Theme C > The Structure Of The Earth > Flashcards

Flashcards in The Structure Of The Earth Deck (6)
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1

3 sections of the Earth

Core
Mantle
Crust

2

What is the crust divided into?

Plates

3

How often do plates move?

About 7 cm each year

4

What is the mantle?

The semi-liquid section below the crust upon which plates float.

5

What is the core?

The very hot sphere in the centre of the Earth mainly composed of an iron-nickel alloy as well as some other elements.

6

Explain how convection currents cause plate movements. [3]

1. The hot core heats the mantle, causing convection currents.
2. As they reach the top of the mantle and spread out, they drag the plates slowly apart.
3. When the convection currents cool and sink back down towards the core, they drag the plates above them closer together.