Flashcards
Plate boundaries: destructive, conservative and collision
Flashcards do conjunto (4)
- 1Explain what is happening here and what type of plate boundary is it?At a destructive plate boundary, convection currents in the mantle (convection currents are where hot rock rise and falls moving plates around) move an oceanic plate and a continental plate towards each other. The oceanic plate is forced under the continental plate because it is more dense. A subduction zone occurs causing an ocean trench. The oceanic plate melts and a magma chamber forms. Over time the magma forces its way up through the cracks in the rock and an explosion of lava happens. As the lava cools new rock forms. Earthquakes also occur because of the friction between the two plates.
- 2What is this diagram showing?At a collision plate boundary two continental plates collide to form mountains. Volcanoes aren't formed however earthquakes will happen because of the force of the two plates colliding.
- 3Explain what happens at a conservative plate boundary.At a conservative plate boundary the plates are pulled apart and the magma rises forming a volcano. The Volcanoes are often underwater because the plates tend to be oceanic so as the lava cools forming new rock, the volcanoes can rise above sea level but they don't ever tend to be very big. Sometimes earthquakes occur because of the force of the two plates being pulled apart.
- 4At a conservative plate boundary two plates slide past one another causing an earthquake because of the friction caused by the friction created when the two plates jolt free from one another. This jolt can either happen in different or in the same direction. No volcanoes are formed here because there isn't any plate being destroyed and there aren't any cracks for the magma to rise up through.
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- FlashCards sobre Sem título, criado por Amy Doherty em 22-09-2015.
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- Amy Doherty · set 2015
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- 19 fev 2016
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