Extrusive igneous rocks. The type of extrusive igneous rock is determined by the composition of the lava.
When magma cools, it forms igneous rock.
contact metamorphism
Igneous rocks are formed from the cooling and solidifying of magma. The resulting rock can be instrusive (magma cooling within the crust) and extrusive (lava cooling on the surface). The most common kind of rocks are Granite (intrusive) and Basalt (extrusive).
Igneous rock froms from magna
Intrusive igneous rock (plutonic rock).
When magma cools, it forms igneous rock.
Intrusive Igneous Rock.
It depends on the composition of the magma, how quickly it cools and crystalises, the temperature and pressure of the original melt.
Igneous rocks form from magma as it cools and solidifies. Examples include granite, basalt, and obsidian.
Gabbro forms from a magma that is rich in iron and magnesium, and poor in silica (quartz). The magma cools and crystallizes deep below the earth's surface. Gabbro is from the same kind of magma as basalt and diabase, but because it cools more slowly, it develops larger crystals.
Igneous rock forms when magma cools and hardens. This type of rock can be classified as intrusive (plutonic) if it cools below the Earth's surface (slow cooling) or extrusive (volcanic) if it cools quickly on the Earth's surface. Examples of igneous rocks include granite, basalt, and obsidian.
Igneous rock is formed through the cooling and solidificatio of magma or lava.
Aphanitic, or fine-grained.
Igneous rock is formed.
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 igneous rock.
Magma is the semi-molten rock material on which the crust floats. The crust is the surface we live on.