CA #2 Review

Could you use the law of superposition on a mountain made of magma?

• yes

• no

Which of these type of fossils would show that the climate of Antarctica had changed over time?

• Ice cores

• Index fossils

• Fossils of green fern plants

• The climate of Antarctica has never changed.

How could a geologist determine how old a layer of rock is by using the law of superposition?

• Measuring the radioactive decay of elements in the sediment

• Locating cracks and faults in the rock layer

• Recognizing that the layers below are older and that the layers above it are younger

• Classifying fossils from a particular time period and identifying which ones are older.

Which type of fossil would you most likely NOT find in area that was once covered by water?

• Fossils of seashells

• Fossils of fish bones

• Fossils of marine organisms

• Fossils of palm fronds

What kind of dating method would you use in area that had dinosaur bones?

• Law of superposition

• Index fossils

• radiometric dating

• radiocarbon dating

What information would a scientist need to get an accurate age of a rock?

• the amount of radioactive element in the rock

• the percentage of each mineral in the rock

• the thickness of the youngest layer

• the amount of weathering present

A geologist is dating rocks, saying that the bottom layer is the oldest and the top layer is the youngest. What did the geologist use to get these ages?

• mineral content

• radioactive decay

• law of superposition

• principle of unconformity

Which layer is the oldest?

• Tapeats

• Muav

• Hermit

• Vishnu Basement Rocks

What is the relative age of a fossil in layer C?

• The fossil in G is older than the fossil in C.

• The fossil in C is older than the fossil in E.

• The fossil in C is younger than the fossil in G.

• The fossil in B is older than the fossil in C.

Which method would be most useful for finding a more precise age of a shell?

• radioactive dating

• magnetic signature

• index fossils

• relative dating