Which characteristics best identify differences between intrusive and extrusive rocks? Check all that apply.
Answers
Answer:
.Extrusive rocks and intrusive rocks both form when hot molten material crystallizes. However, extrusive rocks form from lava at the surface of the Earth, whereas intrusive rocks form from magma underground, often relatively deep in the Earth
Answer:
Extrusive or volcanic rocks:
These rocks are formed when magma breaks through the crust and reaches the surface of the earth (where it is called lava). It cools rapidly and solidifies to form rocks. The common rocks formed in this manner are basalt and obsidian.
Instrusive or plutonic rocks:
These rocks are formed when magma fails to break through the crust and cools slowly under the crust forming rocks. Because of slow cooling it solidifies into rocks with large grains of crystals. The common eg of rocks formed in this manner are granite and dolerite.
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Explanation: