Unit 1 Module 1 Geologic Time

Front

Uniformitarianism

Back

A principle stating that geologic processes that occur today are similar to those that occurred in the past.

Tags

NGSS.MS-ESS1-4

Front

Absolute Age

Back

The numerical age, in years, of a rock or object.

Tags

NGSS.MS-ESS1-4

Front

Relative Age

Back

The age of rocks and geologic features compared with other nearby rocks and features.

Tags

NGSS.MS-ESS1-4

Front

Superposition

Back

The principle that in undisturbed rock layers, the oldest rocks are on the bottom.

Tags

NGSS.MS-ESS1-4

Front

Original Horizontality

Back

Principle that most rock-forming materials are deposited in horizontal layers.

Tags

NGSS.MS-ESS1-4

Front

Lateral Continuity

Back

Principle that sediments are deposited in large, continuous sheets in all lateral directions.

Tags

NGSS.MS-ESS1-4

Front

Inclusions

Back

A piece of an older rock that becomes a part of a new rock.

Tags

NGSS.MS-ESS1-4

Front

Cross-Cutting Relationships

Back

The principle that if one geologic feature cuts across another feature, the feature that it cuts across is older.

Tags

NGSS.MS-ESS1-4

Front

Fossils

Back

The preserved remains or evidence of past living organisms.

Tags

NGSS.MS-LS4-1

Front

Mass Extinctions

Back

The extinction of many species on Earth within a short period of time.

Tags

NGSS.MS-LS4-1