Earths History

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Scientists created the first geologic column by determining the relative ages of sedimentary rock in: Areas all over the world

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Areas all over the world

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If the Cretaceous Period began about 146 Ma, this means it began

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146 million years ago

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Geologic time is divided into

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four eons

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Precambrian time consists of

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the first three eons of earth's history

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A geologic period is usually named for: specific type of fossils, the person who found the first fossils from the period, the place where the characteristic fossils were first discovered, the time in which the period occurred

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the place where the characteristic fossils were first discovered

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Which of the following accurately characterizes precambrian rock? Options: it has been severely damaged, it has many fossils, it has clearly identifiable layers, it contains much limestone

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it has been severely damaged

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The division of geologic time that makes up about 88% of Earth’s history is called

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precambrian time

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Scattered landmasses on Earth merged into a supercontinent during

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the paleozoic era

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The Devonian period is also known as the

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age of fishes

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The mass extinction at the end of the Permian Period led to

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abundant new life-forms in the Mesozoic and Cenozoic Eras.