magmatic rock
nounUK /mæɡˈmætɪk rɒk/
US /mæɡˈmætɪk rɑːk/
Magmatic rock is rock that forms when hot melted rock cools and gets hard.
The dark cliff was made of magmatic rock that had cooled long ago.
OTHER MEANINGS
2. Rock formed from magma that cooled deep underground.
Granite is a magmatic rock that cooled slowly beneath the surface.
3. Rock formed from lava that cooled quickly above ground.
Basalt is a magmatic rock that hardened after a lava flow.
4. Any rock created by the cooling and solidifying of molten material.
Geologists classify magmatic rock by how fast the melt cooled.