Geologic History Facts

In undisturbed strata, the bottom layer is ______ (law of superposition).

• the oldest layer

• the youngest layer

• the middle layer

• the newest layer

Tags

NGSS.MS-ESS1-4

Sedimentary rocks are ALWAYS deposited in ______ layers and underwater (original horizontality).

• horizontal

• vertical

• diagonal

• random

Any fault, fold, intrusion, that disrupts another layer is ______ than the rock layer (always younger than the rock layer).

Tags

NGSS.MS-ESS1-4

Contact metamorphism occurs when ______ partially melts the rock around it (molten rock).

• molten rock

• water

• air

• ice

If an intrusion has no contact meta. (bald) on top it is ______ and was an extrusion (older).

• bald

• smooth

• rough

• layered

An unconformity was caused by ______ and weathering (seen as the line that separates crazy layers from straight layers).

Tags

NGSS.MS-ESS1-4

NGSS.MS-ESS2-2

Unconformities represent a ______ in the geologic record (gap).

• gap

• break

• continuity

• overlap

Tags

NGSS.MS-ESS1-4

Volcanic ash is a good time marker because it ______ over a large area (spreads out quickly).

• spreads out quickly

• stays in one place

• disappears quickly

• is heavy

Tags

NGSS.MS-ESS1-4

Index fossils are found over a wide area and existed for a short period of time.

• True

• False

Radioactive (absolute) dating compares percentage of unstable atoms to stable atoms to get ______ (age of rock).

• age of rock

• color of rock

• density of rock

• location of rock

Tags

NGSS.HS-ESS1-5