Constructive Margins- Rift Valleys

Question 1

How do Rift valleys form

Answer 1

Constructive margins in continental areas, such as east Africa, the brittle crust fractures as sections of it move apart. Areas of crust drop down between parallel faults to form Rift valleys.

Question 2

Largest Rift Valley

Answer 2

African Rift Valley- extends 4,000 km from Mozambique to the Red Sea. From the Red Sea it extends north into Jordan, a tots distance of 5,500km.

Question 3

In some areas..

Answer 3

The inward-facing scraps are 600m above the valley floor and they are often market by a series of parallel step faults

Question 4

What is the area of Rift valleys associated with

Answer 4

Volcanic activity e.g. The highest mountain in Africa, Mt Kilimanjaro

Question 5

The crust here..

Answer 5

Is much thinner than in neighbouring areas, suggesting that tension in the lithosphere is causing the plate to thin as it starts to split.

Question 6

The kind of the African Rift is thought to be..

Answer 6

An emergent plate boundary, the beginning of the formation of a new ocean as Eastern Africa splits away from the rest of the continent.