Which property is used to identify the origin of an igneous rock?

color

density

hardness

crystal size

Crystal size

Explanation:

Took test on Ed it was wrong found out it was Crystal size

Extrusive Rock - igneous rock that forms at Earth's surface as a result of the cooling of lava

Intrusive Rock - igneous rock that forms beneath Earth's surface as a result of the cooling of magma

Answer: Hardness

Igneous rock derives it's name from the Latin word ignis which means fire. It is formed when the magma after volcanic eruption gets cool and solidified either on the surface of earth crust or inside the earth crust. These rocks are characterized by their hardness. These rocks undergoes no chemical weathering but exhibit very low mechanical or physical weathering may occur. Therefore, hardness is the property which can be used to identify the origin of an igneous rock.