Rocks

Question 1

What are the Earth’s main layers?

Answer 1

The Earth’s main layers are:
crust
mantle
core

Question 2

What is the atmosphere?

Answer 2

The layer of gases that surround the Earth.

Question 3

Are rocks solid at room temperature?

Answer 3

Yes

Question 4

What are porous rocks?

Answer 4

Rocks that absorb water.

Question 5

What are sedimentary rocks?

Answer 5

Rocks that are formed through the deposition of sediments.

Question 6

What are sediments?

Answer 6

Small fragments of rock and soil.

Question 7

What is compaction?

Answer 7

When the weight of the sediments on top squashes the sediments at the bottom.

Question 8

What is cementation?

Answer 8

When the water is squeezed out from between the pieces of rock and crystals of different salts form. The crystals then stick the pieces of rock together.

Question 9

How many years does it take for sedimentary rocks to form?

Answer 9

millions

Question 10

What are metamorphic rocks?

Answer 10

These are rocks that are formed from other rocks that are changed because of heat or pressure.

Question 11

What is pressure?

Answer 11

Pressure is force exerted over an area.