igneous rock
nounUK /ˈɪɡniəs rɒk/
US /ˈɪɡniəs rɑːk/
Igneous rock is rock that forms when hot melted rock cools down and gets hard.
The dark igneous rock on the beach came from a volcano long ago.
OTHER MEANINGS
2. Rock made from magma that cooled deep underground.
Granite is an igneous rock that cooled slowly beneath the ground.
3. Rock made from lava that cooled quickly on the surface.
Basalt is an igneous rock that formed from lava at the surface.
4. A type of rock in the three main rock groups, along with sedimentary and metamorphic rock.
In science class we sorted rocks into igneous, sedimentary, and metamorphic groups.