The History of Life on Earth
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| fossil | the solidified remains or imprints of once living organisms
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| relative dating | a method of estimating how old a rock or fossil is compared to other rocks or fossils
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| absolute dating | a method of learning the age of fossils in years
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| geologic time scale | a calendar used by geologist to divide the Earth's history
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| extinct | when species die out completely
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| plate tectonics | the theory of how plates moved
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| precambrian time | the longest part of earth's history which lasted from the time Earth formed (4.6 billion years ago) until about 542 million years ago
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| Paleozoic era | the second longest part of the Earth's history beginning about 542 million years ago and ending about 251 million years ago
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| Mesozoic era | the middle life period that lasted from about 251 million years ago to 65.5 million years ago
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| Cenozoic era | the recent life era which began about 65.5 million years ago
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| primate | a group of mammals that consist of humans, monkeys, and apes
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| hominid | humans and their human like ancestors
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| australopithecine | early apelike hominids
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| neanderthal | recent hominids that hunted large animals, made fires, and wore clothing,
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Created by:
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