Determining Ages of Rocks

The number of years that have passed since the rock formed is its ______________________.

• relative age

• law of superposition

• absolute age

• index fossil

Tags

NGSS.MS-ESS1-4

The age of a rock compared to the ages of other rocks is the rock's

• absolute age

• geologic age

• sedimentary age

• relative age

Relative age is different from absolute age because

• relative age compares rock with surrounding rock while absolute age is how many years since the rock was formed

• relative aging is more accurate than absolute aging

• absolute age compares rock with surrounding rock while relative age is how many years since the rock was formed.

• Relative age is used to determine rock age and absolute age is used to determine age of fossils

Tags

NGSS.MS-ESS1-4

Which rock layer in the diagram seems to be the oldest?

• F

• E

• B

• A

Tags

NGSS.MS-ESS1-4

A scientist wants to find the actual, numerical age of a rock. What would be the most effective way to do this?

• Count the numbers of fossils the rock contains

• Measure the relative amounts of radioactive elements in it

• Judge its position in the rock face relative to that of other rocks

• Estimate how much of it has worn away since it formed originally.

Which layer is the youngest?

• A

• F

• Can not tell

• They are all the same age.

Tags

NGSS.MS-ESS1-4

The __________of rocks is the numerical age and real age of rocks.

• relative age

• half-life

• absolute age

• earth age

relative age

• the age of a rock compared to the ages of the other rocks

• the age of rock given as the number of years since the rock formed

Tags

NGSS.MS-ESS1-4

Sophia had been reading about the history of Earth. She was surprised at the different ways geologists learn about the ages of rocks. Why is it important for geologists to use both relative and absolute ages to determine the age of rocks?

• Scientists want to learn about the age of rocks.

• Scientists need only one way to determine the age of rocks.

• Scientists may not be able to determine the absolute age of some

  rocks.

• Scientists can tell the age of rocks using the law of superposition.

Tags

NGSS.MS-ESS1-4

______ and_____are two concepts used to find the age of fossils

• Time travel; absolute age

• Independent variables; dependent variables

• Relative age; absolute age

• Relative age; Inferred age

Tags

NGSS.MS-ESS1-4