Geohistory

Evidence of mass extinctions of life-forms is preserved in the fossil record. It is inferred that some of these extinctions occurred because of

• earthquakes

• asteroid impacts

• solar eclipses

• tsunamis

Tags

NGSS.MS-LS4-1

What is the amount of carbon-14 remaining after 28,500 years?

• 1/16 g

• 15/16 g

• 1/32 g

• 31/32 g

In which zone is a younger rock unit on top of an older rock unit?

• A

• B

• C

• D

Tags

NGSS.MS-ESS1-4

Which other life-form reached its peak development during the same period in geologic history that these three life-forms first appeared on Earth?

• dinosaurs

• stromatolites

• mastodonts

• eurypterids

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

When 35% of the original radioactive material is left, the sample will be approximately how many years old?

• 5 billion years

• 60 billion years

• 100 billion years

• 120 billion years

Tags

NGSS.HS-PS1-8

Unconformities (buried erosional surfaces) provide evidence that

• many life-forms have become extinct

• faults are older than the rock in which they are found

• part of the geologic record has been destroyed

• metamorphic rocks formed from sedimentary rocks

Tags

NGSS.MS-ESS1-4

Which two letters represent bedrock of the same age?

• A and E

• B and D

• F and G

• D and H

Tags

NGSS.MS-ESS1-4

Letters A, B, C, and D represent fossils found in the rock layers. Which fossil appears to have the best characteristics of an index fossil?

• A

• B

• C

• D

Tags

NGSS.MS-ESS1-4

NGSS.MS-ESS2-3

Which layers most likely formed during the same geologic time period?

• 1 and 8

• 2 and 9

• 3 and 7

• 4 and 5

Tags

NGSS.MS-ESS1-4

The best indicator of an area’s ancient environmental conditions and climates would be the

• type and distribution of fossils

• present plant and animal life

• banding patterns of metamorphosed rocks

• amount of carbon-14 found in sedimentary layers

Tags

NGSS.MS-LS4-1