Question

Which of the following is an example of extrusive rock that has cooled too quickly for grains to form? a. Volcanic glass b. Basaltic rock c. Granitic rock d. All of the above

Answer 1

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⭐️ ANSWER IS OPTION - (B) BASALTIC ROCK.

Answer 2

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: