Multiple Choice
Identify the choice that best completes the statement or
answers the question.
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1.
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What was the first eon of earth called?
a. | Archeon | b. | Hadean | c. | Precambrian | d. | Phanerozoic |
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2.
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The first atmosphere of earth was
a. | filled with water vapor | b. | oxygenated | c. | acidic | d. | helium |
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3.
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When did oxygen begin being released into the atmosphere?
a. | hadean eon | b. | precambrian eon | c. | triassic
period | d. | phanerozoic eon |
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4.
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During which period did most life forms develop?
a. | Jurassic | b. | Triassic | c. | Cambrian | d. | Permian |
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5.
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Evidence shows that there have been at least ____ times when much of the life
forms on the earth died off.
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