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3
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Event during which many species become extinct during a relatively short period of time.
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4
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Earth's long history since it became a planet.
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5
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Term that describes the earth when it was an ice covered frozen planet.
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6
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The longest part of Earth's history which lasted for about 4 billion years.
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8
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Age of fossils and rock layer when compared to age of fossils and layers above and below them.
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10
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Lasted from about 600 million years ago to about 250 million years ago, when basic life forms appeared.
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11
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Process scientists use to determine the actual age of rocks and other objects.
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12
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'Age of Reptiles,' lasted from 248 million years ago until 65 million years ago.
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13
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Our current time which began 65 million years ago, known as the 'Age of Mammals.'
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1
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Preserved remains of organisms that lived long ago.
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2
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States that the youngest layer of rock will be on the top if the layers of rock have not been disturbed.
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7
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No longer in existence, species that have died out and are no longer found living on Earth.
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9
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Most recent supercontinent on Earth, stretched from pole to pole.
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