Plate Boundaries

Question 1

Destructive Plate Boundary

Answer 1

The plates move towards each other and the oceanic plate subducts under the continental, this is because it is more dense.
When the oceanic plate sinks into the mantle, an underwater trench (deep underwater valley) is formed
Friction caused by subduction often causes very strong earthquakes
Friction also causes enough heat to melt the oceanic plate. The molten oceanic plate (magma) rises up through the cracks in the continental plate and erupts onto the surface. Over the years, it can create a composite volcano.

Question 2

Conservative Plate Boundary

Answer 2

A conservative plate boundary occurs when two plates move past each other in the same direction at different speeds, or where two plates move past each other in different directions.
Friction caused by the plates moving past each other causes very strong earthquakes

Question 3

Collision Plate Boundary

Answer 3

A collision plate boundary occurs when two continental plates move towards each other
Neither of them can subduct because they are the same density.
As the two plates move upwards together, they create fold mountains.
Friction caused by the plates moving towards each other causes earthquakes.

Question 4

Constructive

Answer 4

A constructive plate boundary occurs when two plates move away from each other in opposite directions.
As the plates move apart, there is space for magma to rise up.
As the magma wells up, it cools and new crust is formed. This is known as a shield volcano.
As the magma fills the gap, very weak earthquakes can occur.