Structure of the Earth

Question 1

How many layers does the earth have?

Answer 1

4

Question 2

Name the layers of the earth in order from the centre outwards.

Answer 2

• Inner Core
• Outer Core
• Mantle
• Crust

Question 3

What % of the Earth’s volume is the mantle?

Answer 3

75%

Question 4

What temperature is the inner core?

Answer 4

6000 degrees

Question 5

How thick is oceanic crust?

Answer 5

5-10 km thick

Question 6

How thick is continental crust?

Answer 6

30-60 km thick

Question 7

What is oceanic crust made of?

Answer 7

Basalt

Sima- silica and magnesium

Question 8

What is continental crust made of?

Answer 8

Granite

Sial- Silica and aluminium

Question 9

What is the lithosphere?

Answer 9

• Name given to the crust and upper part of the mantle
• 150 km thick
• Strong and rigid

Question 10

What is the asthenosphere?

Answer 10

• Area below the lithosphere

- Made of molten magma which allows the plates to slide

Question 11

In geology, what does the word “discontinuity” mean?

Answer 11

Is used to describe a surface at which seismic waves change velocity

Question 12

What is the name given to the boundary between the crust and the mantle called?

Answer 12

Moho discontinuity

Question 13

What are endogenic forces?

Answer 13

An endogenic process is a geological process that is formed, originated, and located below the surface of the earth. Most of the endogenic processes are folding and faulting.

Question 14

Describe the inner core.

Answer 14

• Solid

- Made up of iron and nickel