Earth History 4.85 Igneous rock / Earth Layers

Front

What is igneous rock?

Back

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

Front

What are the two main types of igneous rock?

Back

The two main types of igneous rock are intrusive (formed from magma) and extrusive (formed from lava).

Front

How do intrusive igneous rocks form?

Back

Intrusive igneous rocks form when magma cools slowly beneath the Earth's surface, allowing large crystals to develop.

Front

How do extrusive igneous rocks form?

Back

Extrusive igneous rocks form when lava cools quickly on the Earth's surface, resulting in small crystals.

Front

What is the difference between intrusive and extrusive igneous rocks?

Back

Intrusive rocks have larger crystals due to slow cooling, while extrusive rocks have smaller crystals due to rapid cooling.

Front

What is the Earth's crust?

Back

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

Front

What is the mantle?

Back

The mantle is the thick layer of rock between the Earth's crust and core, composed of semi-solid rock that flows slowly.

Front

What is the core of the Earth?

Back

The core is the innermost layer of the Earth, consisting of a solid inner core and a liquid outer core, primarily made of iron and nickel.

Front

What is magma?

Back

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

Front

What is lava?

Back

Lava is molten rock that reaches the Earth's surface during a volcanic eruption.