Igneous

The video explains igneous rocks, the most common rock type on Earth, and their formation. It distinguishes between extrusive igneous rocks, formed when lava cools on the surface, and intrusive igneous rocks, which form underground.

What are the most common types of rocks on Earth?

• Sedimentary rocks

• Metamorphic rocks

• Igneous rocks

• Limestone rocks

How are extrusive igneous rocks formed?

• By compression of sediments

• By cooling of magma underground

• By cooling of lava on the surface

• By heat and pressure on existing rocks

Which type of igneous rock forms when lava cools at the Earth's surface?

• Metamorphic rocks

• Sedimentary rocks

• Extrusive igneous rocks

• Intrusive igneous rocks

What is the process of forming intrusive igneous rocks?

• Cooling of magma underground

• Cooling of lava on the surface

• Compression of sediments

• Erosion of existing rocks

Where do intrusive igneous rocks form?

• Underground

• Under the ocean

• In the atmosphere

• On the Earth's surface