Plate Margins Flashcards
Describe the physical processes that happen at a destructive plate margin.
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When oceanic and continental plates collide the denser oceanic plate subducts the continental plate and enters the mantle where it melts. Magma can rise through the lithosphere and erupt as lava through volcanoes. As the oceanic plate subducts, it gets stuck due to friction. Pressure builds up until it is released as an earthquake.
Describe the physical processes that happen at a destructive plate margin.
What are the characteristics of the mantle?
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The thickest section of the Earth. Approximately 2900km.
It is made up of semi-molten rock called magma.
What are the characteristics of the mantle?
Give 2 characteristics of continental crust.
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- Less dense than oceanic crust
- Thicker than oceanic crust
- Lighter than oceanic crust
- Forms the Earth’s continents
- Older than oceanic crust
Give 2 characteristics of continental crust.
Give two possible reasons why tectonic plates move.
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Convection currents & Slab pull (+ ridge push).
Give two possible reasons why tectonic plates move.
Where in the world are the majority of the Earth’s volcanoes and earthquakes found?
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The majority of the Earth’s volcanoes and earthquakes occur around the Pacific Ring of Fire.
Where in the world are the majority of the Earth’s volcanoes and earthquakes found?
