The rocks originated from cooled and crystallized magma flown from the volcanic eruptions on planet surfaces is called igneous rocks. They are also called magmatic rocks due to their formation from magma.
A formation of igneous rocks on the earth's surface is known as extrusive, or volcanic igneous rocks.
How igneous rocks are formed?
- They can be originated in the form of intrusive or extrusive manner. The lava from volcanic eruptions causes the deposition of cooled magma on Earth surfaces and that solidifies after sometimes resulting in the formation of extrusive igneous rocks.
- The extrusive igneous rocks are formed near or above planet surfaces while the intrusive forms below the planet surface because magma cools slowly in intrusive igneous formation compared to fast cooling of extrusive rock formation.
Therefore, the appearance of igneous rocks on the earth's surface is known as extrusive igneous rocks.
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