E-2

How do scientists know that some mountains were once at the bottom of an ocean?

• freshwater rivers flow to the ocean.

• dinosaur bones have been discovered in the mountains.

• marine fossils have been found on the peaks of some mountains.

• saltwater fish are found in some mountain streams.

Tags

NGSS.HS-ESS1-5

NGSS.HS-ESS1-6

Why are index fossils used as guides to determine the age of rocks?

• index fossils are found in igneous rocks.

• all index fossils lived during all the periods of geologic time.

• index fossils are very rare and not commonly found in rocks.

• each index fossil lived during a specific geologic time period.

The radioactive isotope content of a rock can be used to identify which property of the rock?

• the total mass of the rock

• the rate at which the rock formed

• the types of fossils that the rock contains

• the amount of time passed since the rock formed

Tags

NGSS.HS-PS1-8

Which method would be BEST for scientists to use to determine the absolute age of a Precambrian igneous rock?

• index fossils

• law of superposition

• radiometric dating

• law of original horizontality

Which of these would help determine the changes in a plant species over geologic time?

• examining the number of plants in a given area

• examining the type of animals that eat the plant

• examining the type of seeds the plant produce

• examining the fossil record of the plant

Tags

NGSS.MS-LS4-1

According to the law of superposition, which layer is the youngest?

• A

• B

• C

Tags

NGSS.HS-ESS1-5

Which is used in radioactive dating?

• law of superposition

• index fossils

• carbon-14

• geologic time scale

Tags

NGSS.HS-PS1-8

Which process most likely accounts for the major increase in atmospheric carbon dioxide over time?

• increased deforestation

• decreased use of fossil fuels

• increased use of fossil fuels

• decreased deforestation

Tags

NGSS.HS-ESS2-6

Which part of Earth's history is best shown by analysis of ice cores?

• changes in the formation of rock layers.

• changes in the amounts of precipitation

• changes in plant growth

• changes in climate

Tags

NGSS.HS-ESS2-4

NGSS.HS-ESS3-5

What can be used to find the exact age of a rock specimen?

• law of superposition

• ice cores

• radioactive dating

• index fossils