You would expect to find extrusive igneous rocks when lava extrudes on the surface.
What is extrusive igneous rock?
Extrusive or volcanic igneous rock is created when cooling lava extrudes onto the surface or intrudes into small fissures close to the surface. The grains of extrusive igneous rocks are too small to be seen with the human eye, and they have a fine-grained or aphanitic structure.
1.Extrusive Igneous Rock: Igneous rocks that form after lava cools above the surface.
2.These rocks usually form from a volcano (called volcanic rocks.)
3.Cool much more rapidly than intrusive rocks.
4.There is little time for crystals to form, so extrusive igneous rocks have tiny crystals.
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