Choose the most appropriate description for the rock below. This is a light gray

Question

Choose the most appropriate description for the rock below.

This is a light gray to tan rock that reacts to acid and has interlocking crystals.

This is a coarse-grained rock that is composed of angular fragments in a fine-grained matrix. The matrix can be sandy or muddy, as in a debris flow.

This is a metamorphic rock that is primarily composed of calcite or dolomite.

This is a finely crytalline volcanic rock that is black to dark gray that contains holes and is compose of calcium-rich plagioclase, mafic minerals, and some olivine.

This is a finely crystalline volcanic rock that is black to dark gray with no holes, and is primarily composed of calcium-rich plagioclase, mafic minerals, and some olivine.

This sample is dark green, brown to black, and has a nonmetallic luster. The hardness is 2.5 to 4 and the streak is white to gray.

Explanation / Answer

This is a finely crytalline volcanic rock that is black to dark gray that contains holes and is compose of calcium-rich plagioclase, mafic minerals, and some olivine.

it right It is about Igneous rock

Igneous Rock: The rock which is formed by the cooluing of megma. There are mainly two types of igneous rock

1. Intrusive Igneous rock: The rock which is formed by the cristallizaion of molten megma beneath the earth surface is called intrusive igneous rock. Examples: granite, gabbro, diorite and dunite.

2. Extrusive igneous rock: The rocks which is formed on the surface of the earth by the cooling and crystallization of magma is called extrusive igneous rocks. Examples: basalt, rhyolite, andesite, and obsidian.

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