Question 1

Which BEST describes how ice cores are important to the study of geologic history?

Accepted Answer

They contain evidence showing changes in the atmospheric composition over time.

Answer

They hold index fossils, which are used to date the different ice cores.

Answer

They follow the Law of Superposition, which gives reasons for extinctions of species

Answer

They show unconformities, which signal changes in deposition.

Question 2

What do earthquakes tell scientists about the history of the planet?

Accepted Answer

The continents of Earth are continually moving.

Answer

Earth's climate is constantly changing.

Answer

The oceans are much deeper today than millions years ago.

Answer

Dinosaurs became extinct about 65 million years ago.

Question 3

How do scientists know that some mountains were once at the bottom of an ocean?

Accepted Answer

Marine fossils have been found on the peaks of some mountains.

Answer

Dinosaur bones have been discovered in the mountains.

Answer

Saltwater fish are found in some mountain streams.

Answer

Freshwater rivers flow to the ocean.

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