Question

State any three characteristics of igneous rocks.
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Answer 1

Answer:

• Normally contains no fossils.
• Rarely reacts with acid.
• Usually has no layering.
• Usually made of two or more minerals.
• May be light or dark colored.
• Usually made of mineral crystals of different sizes.
• Sometimes has openings or glass fibers.

Answer 2

Answer:

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Explanation:

The type of igneous rocks that form from magma is a function of three factors: the chemical composition of the magma; temperature of solidification; and the rate of cooling which influences the crystallization process. Magma can vary chemically in its composition.

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