Earth info

Question 1

Which type of crust is typically the densest?

Answer 1

Oceanic crust

Question 2

Which type of crust is usually the oldest?

Answer 2

Continental crust

Question 3

Name the main tectonic plates?

Answer 3

Pacific Plate: The largest plate
North American Plate: Includes the United States, Canada, the Arctic Ocean, and the Atlantic Ocean
Eurasian Plate: Includes most of Europe and Asia
African Plate: Includes Africa and the Atlantic Ocean
Antarctic Plate: Includes Antarctica
Indo-Australian Plate: One of the major plates
South American Plate: One of the major plates

Question 4

Who was responsible for the theory of continental drift?

Answer 4

Alfred Wegener

Question 5

Which of the following is responsible for the movement of plates?

Answer 5

Convection currents

Question 6

What is the thickness of oceanic crust?

Answer 6

5 - 10 km thick

Question 7

What is the thickness of continental crust?

Answer 7

30 - 65 km thick

Question 8

What is the correct order of the layers of our earth (inside to outside)?

Answer 8

Inner core, Outer core, Mantle, Crust

Question 9

How do we know about the layers within the earth?

Answer 9

Analysing seismic waves

Question 10

How thick is the outer core?

Answer 10

2,200km