Plate tectonics

Question 1

Name the landforms that are formed with plate movement.

Answer 1

• Ocean ridge
• Rift Valley
• Deep-sea trenches
• Island arcs
• Young fold mountains
• Volcanoes.

Question 2

Give one example of an ocean ridge.

Answer 2

• Mid-Atlantic Ridge.

Question 3

Give one example of a rift valley.

Answer 3

• East African rift valley

Question 4

Give one example of a sea trench.

Answer 4

• Marina Trench.

Question 5

Give one example of Island arcs.

Answer 5

-Tonga islands.

Question 6

Give one example of young fold mountains.

Answer 6

• Rockies (Canada)

- Himalayas(Asia)

Question 7

What is ridge push?

Answer 7

• The result of gravity acting down the slope of the ridge. This is also known as gravitational sliding.

Question 8

What is slab pull?

Answer 8

-Due to the pushing of the subducting plate against the overriding plate, there is frictional resistance that gives rise to both shallow and deep earthquakes in subduction zones.

Question 9

What causes a hotspot?

Answer 9

• A concentration of radioactive elements below the crust causs a hot spot to develop fgrom this a plum of magma rises to eat into the plate above. Forming flattish volcanoes, referred to have shield volcanoes.

Question 10

Name one volcanic event you have studied.

Answer 10

• The eruption of Mt Nyiragongo, Congo January 2002.
• Associated with the African Rify Valley.
• The main crate of the volcano is 250 m deep, two kilometers wide and often contians a lava lake.
• It has erupted 30 times since the ninteenth century.
• It is repsponcible for 40 per cent of Africas recorded volcanic activity.
• The lava is very fluid. Traveling at 90 kilometres per hour.