Unit Test — Unit test Answers

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For which object would a geologist use carbon-14 dating to determine age?

The bones of animals

Rocks older than 50,000 years old

Types of Sedimentary rocks

Parts of Volcanic rock

Which correctly lists the three isotopes that geologists measure to determine the age of an organism’s remains?

argon, nitrogen, and carbon-12

carbon-14, nitrogen, and carbon-12

nitrogen, potassium, and carbon-14

carbon-12, potassium, and argon

Some bacteria live in the roots of plants like soybeans and peas.

to absorb nitrogen-containing compounds from the soil

to release free nitrogen into the atmosphere

to break down nitrogen-containing compounds in dead organisms

to convert free nitrogen into usable nitrogen

Which best describes eras and periods?

Eras have a smaller time span than periods.

Eras and periods are independent of each other.

Eras and periods both appear at the start of the Cambrian period.

Eras were more recently established on the time scale than periods.

How might an entire insect be preserved?

Soft and hard tissues turn the insect into rock.

Tree sap flows over the insect and hardens.

Sediment accumulates over the insect and hardens.

Carbon from the decaying insect leaves a print on a rock.

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