Igneous Rocks Classification and Uses

The video explains the formation of igneous rocks, which are classified into extrusive and intrusive types. Extrusive igneous rocks form from the rapid cooling of magma on the Earth's surface, while intrusive igneous rocks form from the slow cooling of magma beneath the Earth's crust. Examples of extrusive rocks include basalt and pumice, used in construction and exfoliation, respectively. Intrusive rocks like granite and gabbro are used in sculptures and tombstones. The video highlights the differences in formation and applications of these rock types.

What happens to magma during a volcanic eruption?

• It evaporates into the atmosphere.

• Some of it comes out to form igneous rocks, while some cools inside.

• It cools rapidly to form sedimentary rocks.

• It always stays beneath the Earth's surface.

Which type of igneous rock is formed by the rapid cooling of magma on the Earth's surface?

• Intrusive igneous rocks

• Extrusive igneous rocks

• Metamorphic rocks

• Sedimentary rocks

What is basalt commonly used for?

• Building tombstones

• Making sculptures

• Exfoliating skin

• Road bases and railroad ballast

Pumice is an example of which type of igneous rock?

• Metamorphic rock

• Extrusive igneous rock

• Intrusive igneous rock

• Sedimentary rock

How are intrusive igneous rocks formed?

• By rapid cooling of magma on the Earth's surface

• By slow cooling of magma beneath the Earth's crust

• By evaporation of water

• By compression of sediments

Which famous sculpture is made from granite?

• The Great Wall of China

• The Eiffel Tower

• Mount Rushmore

• The Statue of Liberty

What is the main difference between extrusive and intrusive igneous rocks?

• Their location on Earth

• The rate at which the magma cools

• Their mineral composition

• Their color

Which type of igneous rock is gabbro?

• Metamorphic rock

• Sedimentary rock

• Intrusive igneous rock

• Extrusive igneous rock

What is gabbro commonly used for?

• Building roads

• Making tombstones

• Exfoliating skin

• Constructing bridges

What are the two main classifications of igneous rocks?

• Basaltic and granitic

• Volcanic and plutonic

• Extrusive and intrusive

• Sedimentary and metamorphic