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Exam 19: Earths Evolution Through Geologic Time

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Question 21

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The Precambrian rock record indicates that much of Earth's first free oxygen combined with_________ dissolved in water.

A) carbon
B) iron
C) potassium
D) silicon
E) none of the above

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Question 22

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Modern human evolution takes place during the ___________ Period of the_________ Era.

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Quaternary...

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Question 23

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The first true terrestrial animals were the _________.

Which one of the following represents the greatest expanse of geological time?

On continents, large "core areas" of Precambrian rocks, called_________ , dominate the surface.

One hypothesis for the extinction that took place at the end of the Mesozoic is that a large_________collided with Earth.

By the_________ period, large tropical swamps extended across North America, eventually becoming the vast coal deposits of today.

The beginning of the Phanerozoic marks an important event in animal evolution-the appearance of organisms with_________ .

As the solar system began forming, the first materials to condense into small particles were __________ and helium.

Due to a virtual absence of land plants and certain animals, fossil fuels are notably absent in _________rocks.

The _________Eon spans about 88% of Earth's history.

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

The_________ era is known as the "age of flowering plants."

The development of_________ , organisms that reproduce sexually and have cells that contain nuclei, may have increased dramatically the rate of evolutionary change.

The age of Earth is about _________.

This least understood eon of Earth's history has not been subdivided into epochs.

Earth's primitive atmosphere evolved from gases __________.

_________means "planets in the making."

Mammals became the dominant land animals during the_________ era.

The_________ were the dominant trees of the Mesozoic Era.