What is the Earth's crust made of?

What are rocks?

What are minerals?

What are three main types of rocks?

How do igneous rock form?

If the lava cools quickly,

If the lava cools slowly,

What do sedimentary rock consist of?

How long does it take to form a sedimentary rock?

How do metamorphic rocks form?

How many types of minerals are there?

How do we classify minerals?

How are called pure minerals?

Can you name an example of sulphate?

Can you name an oxide?

What is limestone used for?

What is talc used for?

What are diamonds used for?

What is quartz used for?

What is marble used for?