Unit 3 Review HR 1

What is "relative age"?

• An approximate age

• An exact age

• A known age

• Your aunt's age

Tags

NGSS.MS-ESS1-4

NGSS.MS-ESS2-3

How do scientists determine relative age?

• Using measurements of radioactive, unstable elements like Carbon-14

• By determining the order of layers in rock, with older layers below younger

• By finding index fossils

Tags

NGSS.MS-ESS1-4

Using the Law of Superposition, which rock layer would be considered the oldest?

• D - the bottom

• A - the top

• C - near the middle

• Can not tell, as they all have an index fossil

Tags

NGSS.MS-ESS1-4

Which law says: Sedimentary layers are deposited in horizontal sheets & any tilting or folding occurs after deposition

• Law of Original Horizontality

• Law of Lateral Continuity

• Law of Cross-Cutting Relationship

• Unconformities

Tags

NGSS.MS-ESS1-4

NGSS.MS-ESS2-2

List the layers in order from OLDEST to YOUNGEST.

• E, A, B, C, D

• A, B, C, D, E

• D, C, E, B, A

• A, B, C, E, D

Tags

NGSS.MS-ESS1-4

Where is the unconformity in these rock layers?

• Between B & D

• Between E & F

• Between B & C

• Between C & D

Tags

NGSS.MS-ESS1-4

Which law tells us that the intrusion going through the layers shown is the youngest?

• Law of Superposition

• Law of Lateral Continuity

• Law of Original Horizontality

• Law of Cross-Cutting Relationships

Tags

NGSS.MS-ESS1-4

Which law says that sediment layers initially extend sideways in all directions but may later be eroded or broken up?

• Law of Original Horizontality

• Law of Cross-Cutting Relationships

• Law of Lateral Continuity

• Unconformities

Tags

NGSS.MS-ESS1-4

Unconformities are

• periods where deposition stopped and erosion took over

• a period where uplifting and tilting of rock ended

• periods where erosion stopped and deposition took over

Tags

NGSS.MS-ESS1-4

Some of the sedimentary rock layers have been shifted by the fault. Which of these is the youngest?

• The FAULT

• The SILTSTONE layer

• The BASALT layer

• The LIMESTONE layer

Tags

NGSS.MS-ESS1-4