AQA GCSE Chemistry Unit 1 7.1 Earth
- Created by: revisieacocobean
- Created on: 18-05-16 09:16
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- Earth
- Structure
- Core- central ball of iron and nickel (3400km) 4000*C
- Crust- thin layer of rock (5-70km)
- Mantel- mostly solid but is still able to move slowly. (2900km thick)
- Atmosphere- a layer of gases (100km)
- Eathquakes, volcanoes and mountains
- Heat released from the core due to radioactive decay creates convection currents in the mantel
- Causes the plate/crust to move
- (upper part of the mantel that has cracked into pieces)
- Earthquakes: Plates run together
- Mountains: Plates collide
- Volcanoes: plates pull apart
- Causes the plate/crust to move
- Scientists cannot accuratley predict these because-: -they don't know what's happening under the crust-Earthquakes are random
- Heat released from the core due to radioactive decay creates convection currents in the mantel
- Formation Theories
- Wegner, Continental drift
- Noticed...
- Fossils of the same creatures on either side of the Atlantic
- Continents fitted together like a jigsaw puzzle
- Not accepted till after his death...
- No explanation for how continents moved
- Thought there were land bridges that the animals traveled over
- Noticed...
- Shrinking apple
- As the earth cooled, the crust cooled and shrank and wrinkled, forming mountains. Earthquakes were from the movement of the crust sinking
- Wegner, Continental drift
- Structure
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