Rocks

-To describe rocks, geologists observe mineral composition, color, and ...........................

• texture.

• luster

• hardness

Forces affect on these rocks, cause  ................................... changing their shapes and sizes.

• slowly

• rapidly

-Some rocks contain only a single mineral. Other rocks contain several minerals.

• False
• True

-About 20 minerals make up most of the rocks of Earth's mantle.

• false

• true

Granite is generally a light-colored rock that has high ......................................... content.

Granite is generally a light-colored rock that has high silica content, meaning it is rich in the ...............................elements

• silicon and nitrogen.

• silicon and oxygen.

• silicon and sulfur.

Most rocks are made up of particles of minerals or other rocks, which geologists call ...........

• stones

• sediments

• grains.

-To describe the .................. of a rock, geologists use terms that are based on the size, shape, and pattern of the grains.

• origin

• texture

• composition

-Rocks with grains that are large and easy to see are ...........................................

• fine-grained

• coarse-grained.

In ........................................... rocks, grains can be seen only with a microscope.

• coarse-grained

• fine-grained