Tectonic Hazards

Question 1

What are plate margins

Answer 1

The place where tectonic plates meet

Question 2

Describe a destructive plate margin

Answer 2

Where two plates meet
Where an oceanic and continental plate meet, the denser oceanic plate is subducted and destroyed creating gas-rich magma. E.g. volcanoes and oceanic trenches.
When two continental plates meet the ground folds upwards creating fold mountains

Question 3

Describe a constructive plate margin

Answer 3

Two plates move away from each other, magma rises through the mantle to create new crust following cooling

Question 4

Describe a conservative margin

Answer 4

Two plates move sideways past each other in the same direction but at different speeds, crust is neither created nor destroyed

Question 5

Explain how volcanoes are formed

Answer 5

At destructively margins, denser oceanic plate moves down into the mantle where it melts, a pool of magma forms, this magma rises through the vents and erupts.

At constructive margins, the magma rises through the gaps created by plates moving apart.

Question 6

How does tension build up at a destructive margin

Answer 6

When one plate gets stuck as it moves past the other

Question 7

How does tension build up at constructive margins

Answer 7

Builds along cracks of plates as they move away from each other

Question 8

How does tension build up at conservative margins

Answer 8

When plates that are grinding past each other, get stuck

Question 9

What is the focus of the earthquake

Answer 9

Point in the earth where the earthquake starts, the waves are stronger and cause more damage

Question 10

What is the epicentre of an earthquake

Answer 10

The point on the earths surface, straight above the focus