Relative & Absolute Age

Age of a rock compared to another rock.

• Relative Age

• Absolute Age

Tags

NGSS.MS-ESS1-4

Exact age in years of a rock.

• Relative Age

• Absolute Age

Rock A is 532 years old and Rock B is 945 years old.

• Relative Age

• Absolute Age

Tags

NGSS.MS-ESS1-4

Rock B is older than Rock A.

• Relative Age

• Absolute Age

Tags

NGSS.MS-ESS1-4

Rock A's age is determined using radioactive decay.

• Relative Age

• Absolute Age

Layer A of rock is younger than Layer B.

• Relative Age

• Absolute Age

Tags

NGSS.MS-ESS1-4

Rock A has a half-life of 30 years.

• Relative Age

• Absolute Age

Law of superposition, horizontality, cross-cutting relationships, unconformities, and inclusions.

• Relative Age

• Absolute Age

Tags

NGSS.MS-ESS1-4

What is the Law of Uniformitarianism?

• Chemical reactions in the past were slower than they are today.

• The processes in the rock cycle were the same in the past as they are today.

• The Earth’s crust cooled and then remelted before rock layers began to form.

• The composition of the Earth’s atmosphere has been constant.

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS3-1

The oldest rocks are located on the bottom of undisturbed rock layers.

• Law of Superposition

• Law of Horizontality

• Law of Cross-Cutting Relationships

• Law of Unconformities

Answer explanation

Tags

NGSS.MS-ESS1-4