Igneous Rock Review

Front

What type of crystals do extrusive rocks that form quickly above the Earth's surface have?

Back

small crystals

Front

What do basalt, pumice, and obsidian have in common?

Back

They have all of these in common: They form on Earth's surface from the cooling of lava, they are fine-grained, and their crystal grains are small and hard to see.

Front

What type of igneous rock forms when melted lava cools and hardens on Earth's surface?

Back

Extrusive Rock

Front

Does this rock have coarse or fine grains?

Back

fine

Front

What is the process by which igneous rocks are formed?

Back

melting and cooling of magma

Front

What is an igneous rock?

Back

A type of rock formed from the cooling and solidification of magma or lava.

Front

What is the difference between intrusive and extrusive igneous rocks?

Back

Intrusive rocks form from magma that cools slowly beneath the Earth's surface, while extrusive rocks form from lava that cools quickly on the surface.

Front

What is basalt?

Back

A dark, fine-grained extrusive igneous rock that forms from the rapid cooling of lava.

Front

What is pumice?

Back

A light, porous volcanic rock that forms when lava cools quickly and traps gas bubbles.

Front

What is obsidian?

Back

A naturally occurring volcanic glass formed from the rapid cooling of lava.