Landforms Associated With Constructive P.b

Question 1

Name the 2 landforms associated with constructive Pb?

Answer 1

Ocean ridges

Rift valleys - Horst

Question 2

Formation of ocean ridge ?

Answer 2

2 plates diverge in oceanic areas.

Space between is filled with magma rising up from the mantle, this is basaltic lava.

This cools/ solidifies and forms ocean ridge.

Question 3

Example of ocean ridge

Answer 3

Mid Atlantic ridge

Eurasian and N. American plate - through Iceland

Question 4

What hazards occur at ocean ridges?

Answer 4

Volcanoes - Surtsey , Iceland

Earthquakes

Question 5

Formation of Rift Valley

Answer 5

Constructive p.b
As plates move apart brittle crust fractures and areas of crust drop down between the fault to form the valley.

Area between the 2 parallel rift valleys leaves an upstanding bloc known as a Horst

Question 6

Example Rift Valley

Answer 6

East African Rift Valley

Question 7

What hazards occur here ?

Answer 7

Volcanoes - mt nyrigongo

Earthquakes