Exam 12: Earths Evolution Through Geologic Time

The most common Precambrian fossils are ________,layered mounds of calcium carbonate.

Earth's core,mantle,and crust formed during the ________.

At the start of the Triassic,most of the continents were above sea level,and sediments from that time are often red because ________.

The Cenozoic era is often called the "age of ________."

Which of the following was an important factor in determining the different parts of the solar system where the small rocky planets formed versus where the light,gaseous planets formed?

Which era is sometimes called the "age of dinosaurs"?

During the Mesozoic era,the earth developed its modern landscape and life forms.

The atmosphere of Venus is composed primarily of carbon dioxide.

As they formed,due to their high temperatures and comparatively weak gravitational fields,which planets were unable to retain appreciable amounts of hydrogen,helium,and ammonia?

Birds evolved from ________.

During the Cenozoic era,a great wedge of sediments from the eroding Rockies created the Great Plains.

If the earth did not have an atmosphere,there would still be a hydrologic cycle.

Extensive deposits of ________ ore are found worldwide in Precambrian rocks.

The dominant life forms during the Cenozoic Era were ________.

What were the three gases that made up Earth's original atmosphere?

By the close of the Paleozoic,all the continents had fused into the single super continent of ________.

The heaviest element produced by nuclear fusion in a young star is ________.

A major site of sediment deposition during the Cenozoic was ________.

The Cenozoic era is the age of mammals.

One important reason we do not know much about the geologic history of the Precambrian is that ________.