Earth History 4.85 Igneous rock / Earth Layers

Front

What is an igneous rock?

Back

An igneous rock is formed from the cooling and solidification of molten rock, either magma (beneath the surface) or lava (on the surface).

Front

What does it mean if an igneous rock has no crystal grains?

Back

It indicates that the rock was formed from lava that cooled quickly, preventing crystal formation.

Front

What is the mantle?

Back

The mantle is a layer of the Earth located beneath the crust, composed of semi-solid rock that can flow slowly.

Front

What is magma?

Back

Magma is molten rock located beneath the Earth's surface, which can rise to form igneous rocks when it cools.

Front

What is the difference between extrusive and intrusive igneous rocks?

Back

Extrusive igneous rocks form from lava that cools quickly on the Earth's surface, while intrusive igneous rocks form from magma that cools slowly beneath the surface.

Front

What are the characteristics of intrusive igneous rocks?

Back

Intrusive igneous rocks typically have larger crystals due to the slow cooling process.

Front

What are the characteristics of extrusive igneous rocks?

Back

Extrusive igneous rocks usually have smaller crystals or a glassy texture due to rapid cooling.

Front

What type of igneous rock is granite?

Back

Granite is an intrusive igneous rock, known for its coarse-grained texture and composition.

Front

What is the Earth's crust?

Back

The crust is the outermost layer of the Earth, composed of solid rock and minerals.

Front

What is the outer core?

Back

The outer core is a liquid layer of the Earth located beneath the mantle, composed mainly of iron and nickel.