Exam 12: Earths Evolution Through Geologic Time

The first bacteria probably used______ instead of water as a source of hydrogen.

Some elements are released from Earth's interior to the surface through a process called______ .

Fossil fuels are especially abundant in ______rocks.

The major adaptions that made it possible for mammals to evolve into their modern forms included all of the following except______ .

On each continent, large "core areas" of Precambrian rocks, called ______, dominate the surface.

As the solar system began forming, the first materials to condense into small particles were ______and nickel.

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

Much of the original free oxygen in the atmosphere combined with iron dissolved in water to become ______ .

What would have happened to Earth if it were 10% closer to the sun?

Human evolution takes place during the______ period of the _ era.

Continental crust is formed by______ .

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?

What organic compounds are essential for DNA and RNA to form?

What is the role of density in the changes to the earth's atmosphere over time?

Examine the words and/or phrases below and determine the relationship among the majority of words/phrases. Choose the option that does not fit the pattern.

Which type of bacteria thrive in environments that lack free oxygen?

Earth's primitive atmosphere evolved from gases ______.

The North American Cordillera formed as a result of______ .

During the late Paleozoic, the present- day North America, Europe, western Asia, Siberia, and perhaps China formed the northern continent of______ .

The rock formations of the ______era are more widespread and less disturbed than those of any other time.