The Restless Earth

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  • Created by: Nicole D
  • Created on: 23-12-13 17:07
The Restless Earth
14 Questions
1 of 18
Why is teh Earth's crust unstable?
Crust is very thin and split up into plates so these move around
2 of 18
Define the following key words:
.
3 of 18
Tectonic
Rocks - includes the crust of the Earth
4 of 18
Plate Tectonics
The movement of the earth's crust
5 of 18
Natural Hazard
Event caused by natural surroundings, which is a threat to humans and can't be controlled
6 of 18
Plate
One of the divisions of the crust
7 of 18
Plate Margin
Boundary between to plates
8 of 18
Relatively how old is the Earth?
4.6 billion years old
9 of 18
Describe the following structures of the Earth:
.
10 of 18
Crust
Broken into 7 large plates ; (Continental) - lighter and less dense rocks ; (Oceanic) - thinner and denser rocks
11 of 18
Mantle
Very hot (up to 3800 degrees) + Viscous (slushy layer)
12 of 18
Core
Excessive heat (4300 degrees) + Under huge pressure
13 of 18
What is the thickness of the following?
.
14 of 18
Crust
5 - 30 km thick
15 of 18
Mantle
2900 km thick
16 of 18
Core
6370 km (from surface)
17 of 18
What drives the movement of the plates across the earth's surface?
The very hot core heats the mantle consisting of molten rock. The magma then becomes less dense and expands due convection current. As they rise, the mantle sticks to the plate. Currents spread out causing plates to move
18 of 18

Other cards in this set

Card 2

Front

Why is teh Earth's crust unstable?

Back

Crust is very thin and split up into plates so these move around

Card 3

Front

Define the following key words:

Back

Preview of the front of card 3

Card 4

Front

Tectonic

Back

Preview of the front of card 4

Card 5

Front

Plate Tectonics

Back

Preview of the front of card 5
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