Unit 6 Geohistory and Fossils

Identify the choice that best completes the statement or answers the question. The principle that Earth's history can be explained by current geologic processes is

• unconformity

• uniformitarianism

• superposition

• evolution

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6.2

Identify the choice that best completes the statement or answers the question. Younger layers of undisturbed sedimentary rock are above older layers according to a.

• the principle of uniformitarianism

• the principle of sedimentarianism

• the law of superposition

• the angular unconformity

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6.1

Identify the choice that best completes the statement or answers the question. The boundary between two sedimentary rock layers is called a(n)

• crosscut plane

• crosscut layer

• bedding plane

• bedding layer

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6.2

The age of an object in relation to the ages of other objects is a.

• absolute age

• comparative age

• relative age

• relational age

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6.1

Identify the choice that best completes the statement or answers the question. A fault or body of rock is younger than any other body of rock it cuts through according to the law of

• crosscutting relationships

• superposition

• uniformitarianism

• averages

Tags

6.2

The numeric age of an object is called a.

• relational age

• comparative age

• relative age

• absolute age

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6.1

Identify the choice that best completes the statement or answers the question. Carbon-14 is an isotope

• formed by radioactive decay.

• used to date objects less than 70,000 years old.

• used to date objects over 6,000 years old.

• that cannot be used to date objects.

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6.2

How many years of deposition are represented by a single varve?

• three

• two

• one

• The number of years cannot be measured.

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6.2

Index fossils found in rock layers in different areas of the world indicate that the rock layers

• formed during the same period of time.

• formed during different periods of time.

• are still forming.

• never fully formed.

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6.2

Almost all fossils are discovered in

• volcanic rock.

• metamorphic rock.

• sedimentary rock

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6.2