Igneous rock is formed.
Igneous Rock is formed when magma cools and hardens. It depends on whether it cools above ground or under ground for the size of the mineral crystals forming inside it.
Extrusive igneous rock is one of two different types of igneous rocks. The other kind is intrusive igneous rock. Intrusive igneous rock is formed when magma in Earth's lithosphere cools and hardens. Extrusive igneous rock is formed when lava on Earth's surface cools and hardens.
Intrusive igneous rock.
Extrusive igneous rocks such as basalt or rhyolite.
When magma cools, it forms igneous rock.
If the magma cools on the surface of the crust, it is called extrusive igneous rock, such as pumice, basalt or rhyolite. If the magma cools inside the crust, it is called intrusive igneous rock, such as granite.
Intrusive (Plutonic) Igneous Rock.
Igneous rock is formed through the cooling and solidificatio of magma or lava.
Igneous rocks
igneus rock
Aphanitic, or fine-grained.
Igneous rock