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saw5 [17]
3 years ago
12

Identify the igneous rocks.

Biology
2 answers:
slavikrds [6]3 years ago
8 0

Answer:

Igneous rock, any of various crystalline or glassy rocks formed by the cooling and solidification of molten earth material. Igneous rocks constitute one of the three principal classes of rocks, the others being metamorphic and sedimentary.

Explanation:

Ede4ka [16]3 years ago
6 0

Explanation:

Steps in Identification:

Determine the color (indicates mineral composition)

Determine the texture (indicates cooling history)

Phaneritic = large grains.

Aphanitic = small grains (too small to identify with the naked eye)

Porphyritic = fine grains mixed with larger grains.

Vesicular = holes.

Glassy = glass-like.

Igneous rocks are formed from lava or magma. Magma is molten rock that is underground and lava is molten rock that erupts out on the surface. The two main types of igneous rocks are plutonic rocks and volcanic rocks. Plutonic rocks are formed when magma cools and solidifies underground.

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