Igneous Rocks

Front

What are igneous rocks?

Back

Igneous rocks are formed from the cooling and solidification of molten rock (magma or lava).

Front

What is the difference between intrusive and extrusive igneous rocks?

Back

Intrusive igneous rocks form underground from magma, while extrusive igneous rocks form at the Earth's surface from lava.

Front

Give an example of an intrusive igneous rock.

Back

Granite is an example of an intrusive igneous rock.

Front

Give an example of an extrusive igneous rock.

Back

Basalt is an example of an extrusive igneous rock.

Front

What does the term 'molten' mean?

Back

Molten means melted or in a liquid state, typically referring to rock that has been heated to a high temperature.

Front

How do igneous rocks form?

Back

Igneous rocks form when melted rock cools and hardens.

Front

What is the process of cooling and solidification of magma called?

Back

The process is called crystallization.

Front

What is obsidian?

Back

Obsidian is a type of extrusive igneous rock that is glassy and formed from rapidly cooled lava.

Front

What is pumice?

Back

Pumice is a light, porous extrusive igneous rock that forms when lava cools quickly and traps gas bubbles.

Front

Are igneous rocks some of the oldest rocks on Earth?

Back

Yes, igneous rocks are among the oldest rocks on Earth.