Tectonic Hazards Additional

Question 1

What are formed at a constructive plate margin?

Answer 1

Sheild volcanoes, small non-destructive earthquakes and oceanic ridges.

Question 2

How are earthquakes formed at constructive plate margins

Answer 2

• As the plates move apart, it causes hot magma from the mantle to rise up to create new oceanic crust This moves via (slab pull, ridge push, and convection current) This new crust often fractures, causing small non non-violent earthquakes.

Question 3

How are ocean ridges created

Answer 3

Hot magma rises up and pushes the crust to form oceanic ridges

Question 4

How are steep valleys formed

Answer 4

On land, when the plates move away from each other, it causes the land to drop between them, creating a steep-sided valley called a rift valley.

Question 5

How are Sheild Volcanoes created at constructive pate margins

Answer 5

In this rift valley magma often erupts on the surface of this land. This magma is often runny and spreads out before solidifying, creating shield volcanoes with wide, gently sloping sides.

Question 6

Features of shield volcanoes

Answer 6

• Formed on constructive plate margins
• Have runny lava which spreads along, causing the sides of the volcano to be gently sloping and having a wide base.

Question 7

Example of constructive plate margins

Answer 7

American plate and Eurasian