Plate boundaries: Completed
- Created by: Janelle M
- Created on: 07-06-18 12:57
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- Plate boundaries
- Convergent plate boundaries
- A convergent plate boundary, also known as a destructive plate boundary
- it usually involves an oceanic plate and a continental plate
- the plates move towards one another and this movement causes earthquakes
- Subduction
- the plates collide
- the oceanic plate is forced beneath the continental plate
- this happens because the oceanic plate is heavier than the continental plate
- Composite volcano
- when the plate sinks into the mantle it melts to form magma
- the pressure of the magma builds up beneath the earth's surface
- the magma escapes through weaknesses in the rock and rises through a composite volcano. The volcanic eruptions are often violent, with lots of steam, gas, and ash
- Collision boundary
- the land buckles upwards to form fold mountains
- if two continental plates collide, neither can sink
- earthquakes can occur at collusion boundaries
- Divergent plate boundaries
- the plates move apart from one another
- when this happens the magma from the mantle rises to make or construct new land in the form of a shield volcano
- the movement of the plates over the mantle can cause earthquakes
- conservative plate boundaries
- the plates move past each other or side by side
- moving at different speeds. Friction occurs as plates try to move and become stuck.
- Pressure builds up because the plates are still trying to move.
- When the pressure is released, it sends out huge amounts of energy, causing an earthquake.
- The earthquakes at a conservative plate margin can be very destructive as they occur close to the Earth's surface.
- There are no volcanoes at a conservative plate boundary.
- Convergent plate boundaries
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