Classifying Rocks

As a geologist, how must you examine a rock correctly?

Answer explanation

You must look inside the of the rock because of the effects of ice, liquid water, and weather can change the outer surface of a rock.

When studying a a rock smaple, geologists must observe the rocks (more than one correct answer, choose all that apply)

• mineral compostion

• color

• texture

• density

What are the "rock-forming minerals"

Answer explanation

About 20 minerals that make up most of Earth' crst.

Tags

NGSS.MS-ESS3-1

How can geologists identify minerals that rocks can contain

Answer explanation

Geologists observe the shape and color of crystals in a rock to identify the minerals that the rock contains.

Testing the surface of a rock with acid determines whether the rock includes minerals made of compounds called

• minerals

• carbonates

• geodes

• crystals

Tags

NGSS.MS-PS1-2

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

Tags

NGSS.MS-ESS2-1

Grains give a rock its texture

• true

• false

Give an example word for a rocks texture

Answer explanation

smooth & glassy or rough & chalky

Grains in a rock that are large and easy to see can be classified as

• coarse-grained

• no visible grain

• fine-grained

In some rocks, the grains are so small that they can only be seen with a microscope. These rocks are classified as ____ _______.