What is geology?

What were the first types of rocks to have formed on Earth?

How are igneous rocks formed?

Are igneous rocks still formed today?

The First Rocks

Where do scientist believe magma forms?

What makes magma less dense?

What happens when magma reaches the surface?

What is the temperature of Lava?

What happens when magma cools below the surface?

What happens when magma cools above the surface?

What are crystals?

How is the size of crystals determined?

What are the characteristics of igneous rocks?

Texture

Colour