Intrusion and Extrusions

Molten rock above the ground is called

• lava

• magma

This type of rock is a volcanic rock, made from cooled lava or magma.

• igneous

• sedimentary

• metamorphic

This type of igneous rock is formed below the Earth's surface.

• intrusive

• extrusive

This type of igneous rock is formed above the Earth's surface.

• intrusive rock

• extrusive rock

Intrusive igneous rocks cool very slowly. The grains of these rocks are

• large

• small

Extrusive igneous rocks are formed on Earth's surface from hardened lava. These rocks have what size of grains or particles?

• small

• large

Obsidian, pumice and basalt are formed on Earth's surface from hardened lava. These are types of

• intrusive igneous rocks

• extrusive igneous rocks

This is granite. According to the large grains, what type of rock would this be?

• intrusive

• extrusive

This is obsidian which was formed on Earth's surface. What group of rock does this belong?

• intrusive

• extrusive

Which rock took longer to form?

• granite

• basalt