Classifying Rocks

Front

What are the three major groups that geologists classify rocks into?

Back

Metamorphic, Sedimentary, Igneous.

Front

What type of rock forms when an existing rock is changed by heat, pressure, or chemical reactions?

Back

Metamorphic rock.

Front

What is the term for the look and feel of a rock's surface?

Back

Texture.

Front

What do geologists observe to identify the minerals that a rock contains?

Back

Crystals.

Front

What type of rocks have grains that are not present, even when viewed under a microscope?

Back

No-grained rocks.

Front

What is the process called when rocks are formed from the accumulation of sediments?

Back

Sedimentation.

Front

What type of rock is formed from cooled magma or lava?

Back

Igneous rock.

Front

What is the term for the size, shape, and arrangement of grains in a rock?

Back

Grain structure.

Front

What type of rock is formed from the alteration of minerals due to heat and pressure?

Back

Metamorphic rock.

Front

What is the main characteristic of sedimentary rocks?

Back

They are formed from particles and organic materials that have settled and compacted.