Question

Fill in the blanks:1. _________ magma cools and consolidates without growth of mineral grains 2. _________ mineral grains are of roughly equal size and coarse enough to be seen without a microscope or magnifying glass 3. _________ rock has two or more, distinctly different-sized populations of mineral grains 4. _________ a magnifying glass or microscope is needed to see individual mineral grains

Answer 1

Answer: 1. Glassy ;2. Phaneritic; 3.Porphyritic; 4. Aphanitic.

Explanation: Glassy magma cools and consolidates without growth of mineral grains.

Phaneritic mineral grains are of roughly equal size and coarse enough to be seen without a microscope or magnifying glass.

Porphyritic rock has two or more, distinctly different-sized populations of mineral grains.

Aphanitic, a magnifying glass or microscope is needed to see individual mineral grains.

Answer 2

Answer:

4. Glassy

5.phaneritic

6. Porphyritic

7. Alphanitic

Explanation:

Glassy or vitreous textures occur during some volcanic eruptions when the lava is quenched so rapidly that crystallization cannot occur. The result is a natural amorphous glass with few or no crystals. Examples include obsidian

Examples of aphanitic igneous rock include basalt, andesite and rhyolite.

Aphanitic rocks in contrast to phaneritic rocks, typically form from lava which crystallize rapidly on or near Earth's surface.

Porphyritic textures develop when conditions during cooling of a magma change relatively quickly

Explanation: