Tectonic Hazards

Question 1

Constructive/divergent

Answer 1

Ocean plates move apart because of convection currents. Seafloor spreading occurs and space is left between the tectonic plates.
Magma rises and pressure builds up.
Underwater volcanoes are created.
-Underwater volcanoes in low magnitude earthquakes occur.

Question 2

Destructive

Answer 2

Oceanic and continental plates move towards each other because of convection currents.
Oceanic crust sinks because it is denser.
The crust melts and rises.
Pressure builds up.
It is released as a violent volcano or earthquake.
-Explosive volcanoes and violent earthquakes.

Question 3

Conservative margin

Answer 3

Tectonic plates move in different directions or speeds.
They get stuck due to friction.
Pressure builds up.
Until it is eventually released in the form of seismic waves.
Earthquakes occur.
-No volcanoes, violent earthquakes.

Question 4

Collision margin

Answer 4

Continental plates move towards each other because of convection currents.
Plates are too ‘light’ to sink into the mantle.
Plates buckle and fold to form mountains.
- Volcanic activity is rare, earthquakes.

Question 5

Continental crust:

Answer 5

Mainly granite.
Forms the continents.
Later.
Thicker.

Question 6

Oceanic crust:

Answer 6

Mainly basalt.
Forms the ocean plates.
Heavier.
Thinner.