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Terrestrial planets are denser than the Jovian planets.

Swampy conditions during the Carboniferous lead to coal deposits forming throughout North America.

The Sierra Nevadas formed during what Cordilleran orogeny?

What is a mass extinction?

During the Paleozoic, three large mass extinctions took place. They occurred during the:

What percentage of mammals alive today belong to the order Rodentia?

Sea levels were lower in the Mesozoic than they are today.

​The degree to which detrital particles have had their sharp edges and corners smoothed off by abrasion is ____.

Anthropoids and prosimians both thrived in cold, dry climates during the Cenozoic.

The richest assemblages of dinosaur fossils formed in the __________________ during post-flood deposition.