review for test
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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| What are the remains or prints of a dead organism that is usually found in rock layers? | fossils
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| What is a fossil that is a hollow space in rock left by a dead organism? | mold
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| What is a fossil that has the same shape as the original organism? | cast
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| what is a fossil that shows an animal's activity? | trace fossil
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| what is the unchanged remains of an organism or part of an organism called? | true form fossils
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| what is a fossil that helps scientists date rock layers? | index fossil
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| What are tiny bits of matter that settle in water called? | sediment
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| What is rock that forms from the deposit of sediment, usually found in layers, called? | sedimentary rock
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| Where would you find older rock layers -- at the top or the bottom? | at the bottom
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| what type of rock are most fossils found in? | sedimentary rock
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| what do index fossils give us clues to? | changes in earth's climate and surface, and the age of rock layers
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| how old do scientists believe the earth is? | 4.6 billion years
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| what are the four eras of earth's history? | Precambrian, paleozoic, mesozoic, and cenozoic
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| in what era are fossils hard to find? | precambrian era
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| In what era did the formation of the earth begin? | precambrian era
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| which era is the longest? | precambrian era
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| what era is known as "the age of ancient life"? | paleozoic era
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| what era did trilobites live in? | paleozoic era
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| when did the first air breathing animals appear? | paleozoic era
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| Which era is known as "the age of the dinosaurs"? | mesozoic era
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| when did we see the first small mammals? | mesozoic era
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| when did the dinosaurs die out? | mesozoic era
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| what era are we currently in? | cenozoic era
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| when did humans appear? | cenozoic era
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| what era experienced ice ages? | cenozoic era
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