Rocks and Minerals

Rocks are made of ______________.

• Minerals

• Vitamins

• Plants

When tiny pieces of rocks pile up, stick to each other, and harden, ____________________ rocks are formed.

• Metamorphic

• Igneous

• Sedimentary

When heat and pressure are applied to sedimentary and igneous rocks, _____________________ rocks are formed.

Explain how igneous rocks are formed in your own words.

Scientists describe rocks by 4 properties. Choose all the properties.

• Hardness

• Thickness

• Color

• Size

Why do igneous rocks have dark color?

In Jeju island, you can see many ___________________ rocks.

What kind of rock do we call when it changes from one kind of rock to another like a caterpillar becoming a butterfly?

The rock in the picture is a sedimentary rock. Why do you think this rock is a sedimentary rock? (*Look at the picture carefully.)

Scientists describe that a diamond is very hard to break. Which number shows the hardness of the diamond?

• 1

• 0.3

• 5

• 10