Earth & Space science: study guide chapt. 8

The principle that Earth’s history can be explained by current geologic processes is..

• superposition

• uniformitarianism

• unconformity

• evolution

younger layers of undisturbed sedimentary rock are above older layers according to..

• principle of uniformitarianism

• principle of sedimentarianism

• law of superposition

• angular unconformity

boundary between 2 sedimentary rock layers is called

• crosscut plane

• crosscut layer

• bedding plane

• bedding layer

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

• absolute age

• comparative age

• relative age

• relational age

fault / body of rock is younger than any other body of rock it cuts thru according to the law of

• crosscutting relationships

• superposition

• uniformitarianism

• averages

how much sedimentary rock is deposited over 1,000 years?

• 3 cm

• 3 m

• 30 m

• 30 cm

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

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

• 3

• 2

• 1

• years cannot be measured.

rates of erosion aren’t used to date geographical features over a million years old bc..

• rates of erosion are constant over a million years

• erosion ceases over a million years

• rates of erosion may greatly vary over a million years

• rates of erosion are constant only for abt 20,000 years

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