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25 Cards in this Set
- Front
- Back
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What are the 3 parts of the earths structure |
Inner core Outer core Mantle Crust |
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What is the core? |
A ball of solid iron and nickel at the centre of the Earth |
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What is the mantle? |
The semi-molten part around the core which moves very slowly |
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What is the crust? |
The very thin outer layer of the Earth, measures about 20km |
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Are tectonic plates? |
The Slabs that the Earth's crust is divided into and floats across the mantle |
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What are the two types of crust that tectonic plates are made of? |
Oceanic crust Continental crust |
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What is continental crust like? |
Thicker Less dense |
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What is oceanic crust like? |
Thinner More dense |
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Why do tectonic plates move? |
The Rock in the mantle underneath them is moving |
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What are the places where the plates meet called? |
Boundaries or plate margins |
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What are the 3 types of plate margins? |
Destructive Constructive Conservative |
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What are destructive margins? |
Where two plates are moving towards each other |
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Which pairs of crust are involved in destructive margins? |
two continental Oceanic meets continental |
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What happens when two continental plates are part of a destructive margin? |
The plates smash together but no crust is destroyed |
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What happens when an oceanic plate meets an continental plate at a destructive margin? |
The denser oceanic plate is forced down into the mantle & destroyed |
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What does a conservative margin look like? |
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What is made by the oceanic & continental plate meeting at a destructive margin? |
Volcanoes & ocean trenches |
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What are ocean trenches? |
Very deep sections of the ocean floor where the oceanic plate goes down |
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What are constructive margins? |
Where 2 plates are moving away from each other. magma rises from the mantle to fill the gap and cools, creating new crust |
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What are conservative margins? |
Where 2 plates are moving sideways past each other, or moving in the same direction but at different speeds
Crust isn't created or destroyed |
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What is an example of a destructive margin? |
Along the east coast of Japan |
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What is an example of a a constructive margin? |
At the mid-Atlantic ridge |
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What does a destructive margin look like? |
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What does a constructive margin look like? |
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What does a conservative margin look like? |
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