Flashcards
Geography FlashCards
Cards in this deck (4)
- 1Name the 4 parts of the Earth's Structure1. The Crust - It's a very thin layer of rock which varies between 6-70 km thick
2. The Mantle - Semi-molten rock which contain convection currents
3. The Outer Core - Liquid, largely made up of iron
4. The Inner Core - Solid, made up from iron and nickel - 2What are convection currents and how are they caused?Convection currents in the mantle are caused from semi-molten rock near the crust sinking due to its density. As it gets closer to the core, it becomes less dense and floats. This repeats in a cycle, convection currents cause tectonic plates to move
- 3Name the 4 different plate margins- Destructive Plate Boundary
- Constructive Plate Boundary
- Conservative Plate Boundary
- Collision Plate Boundary - 4What happens at a destructive plate boundary?At a destructive plate boundary two plates are moving towards each other. The denser oceanic plate is subducted underneath the continental plate. As the oceanic plate is forced below the continental plate it melts to form magma and earthquakes are triggered. The magma collects to form a magma chamber. This magma then rises up through cracks in the continental crust. As pressure builds up, a volcanic eruption may occur. The continental crust is pushed together, forming fold mountains, e.g. The Alps.
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- Flashcards on Geography FlashCards, created by zundus on 16/05/2015.
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- zundus · May 2015
- Updated
- Feb 19, 2016
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