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Cards In This Set
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Crust
•Made up of two different types; continental and oceanic. Mantle •Molten rock. •1200°C Inner Core •Solid. •Iron and nickel. •Temperatures and pressure both very high. •3700°COuter Core •Molten iron and nickel. •Less pressure. Outer Core •Molten iron and nickel. •Less pressure. |
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Convection Currents
- Convection currents are what cause the plates to move. |
1) By the time the semi-molten rock reaches the crust, it has cooled and spreads out, carrying the plate with it. It then sinks towards the core.
2) Molten rock cools and sinks further towards the core to be reheated once again. 3) Molten rock in the mantle is heated and begins to rise towards the crust. |
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Distribution of plates
- The Earth’s crust is made up of 14 major plates and 38 minor plates. |
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Different types of plates
Continental: - Thicker (50km) - Older - Less Dense |
Different types of plates
Oceanic: - Thinner (5-6km) - Younger - Dense (Heavier) |
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CONSTRUCTIVE PLATE
- Where two plates move away from each other. - Volcanoesand earthquakes are common at this types of plate boundary. - Example: Eurasian and North American Plate. |
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