Strata

This fern fossil is from the Grand Canyon and was found in the desert outside of Yuma. How did it get there?

• Weathering and erosion of the Colorado River carried it to Yuma.

• A rockclimber from Colorado dropped it in Yuma.

• Forest rangers spread fossils evenly around the United States for tourists to find.

• When Pangaea separated, the fossils were uplifted and deposited in the Yuma desert.

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

NGSS.MS-LS4-1

What scientific law tells us that in rock strata, the oldest layer is at the bottom and the youngest layer is at top?

• Cross-cutting

• Original Horizontality

• Superposition

• Unconformities

Tags

NGSS.MS-ESS1-4

In this diagram, what scientific law tells us that rock layer E is older than rock layer C?

• Cross-cutting

• Superposition

• Inclusions

• Unconformities

Tags

NGSS.MS-ESS1-4

In this diagram, what scientific law tells us that rock layer C is older than rock layer A?

• Cross-cutting

• Inclusions

• Superposition

• Unconformities

Tags

NGSS.MS-ESS1-4

In the diagram, what scientific law tells us that rock layer D is older than rock layer B?

• Cross-cutting

• Inclusions

• Superposition

• Unconformities

Tags

NGSS.MS-ESS1-4

Correctly sequence the layers of rocks oldest to youngest 

• C,E,D,A,B

• C,E,D,A,B

• C,E, D,B,A

Tags

NGSS.MS-ESS1-4

Correctly sequence the layers of rocks oldest to youngest 

• A,D, C, B, E
• E, B,C D, A
• B,E,C, D, A

Tags

NGSS.MS-ESS1-4

Scientific study of rock layers

• Archeology

• Stratigraphy

• Paleontology

• Geology

Tags

NGSS.MS-ESS1-4

NGSS.MS-ESS2-2

A gap in the sequence of sedimentary rock layers caused by erosion.

• Inclusion

• Unconformity

• Cross-cutting

• Isotope

Tags

NGSS.MS-ESS1-4

Fossils made from organisms that were fairly common and existed only during a certain span of time, used to determine the age of rock layers.

• Index Fossils

• Unconformities

• Inclusions

• Trace Fossils

Tags

NGSS.MS-ESS1-4