Igneous Rocks

What is the outermost layer of the Earth called?

• Mantle

• Inner Core

• Outer Core

• Crust

What type of rock makes up a large portion of the Earth's crust?

• Sedimentary

• Metamorphic

• Igneous

• Limestone

How is extrusive igneous rock formed?

• By cooling and hardening inside the Earth

• By cooling and hardening outside the Earth

• By pressure from the Earth's layers

• By sediment deposition

Which type of igneous rock usually has large crystals visible in its structure?

• Metamorphic

• Sedimentary

• Extrusive igneous

• Intrusive igneous

Why do extrusive igneous rocks cool very quickly?

• They are formed deep underground

• They are formed under high pressure

• They are formed in cooler atmospheric conditions

• They are formed near active volcanoes

What happens when magma erupts from a volcano according to the diagram?

• Formation of sedimentary rock

• Formation of extrusive igneous rock

• Formation of metamorphic rock

• Cooling of the Earth's crust

Which type of igneous rock is formed when buried rock is melted by magma in the Earth's crust?

• Extrusive igneous rock

• Sedimentary rock

• Intrusive igneous rock

• Metamorphic rock

Which of the following igneous rocks has very large grains?

• Basalt

• Rhyolite

• Granite

• Pegmatite

What can scientists use to start sorting rocks based on their features?

• Chemical tests

• Their eyes

• Microscopes

• Weight measurements