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14 Cards in this Set

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Precambrian Time
The earliest time in the histoyr of the earth
Paleozoic Era
The time in the earth's history from 570 to 250 million years ago when man's new life forms appeared and organisms first lived on land
Mesozoic Era
The time in the history of the earth, about 250 to 65 million years ago during which reptiles were the major life form
Cenozoic Era
Th time we currently live in
Shield
A region of Precambrian rock
Fossils
The trace or organism that was once alive
Vertebrates
Animal or organisms with a back bone
Invertebrates
Animals or organisms without a back bone
Ferns
A class of plants with feather like leaves
Reptile
A cold vertebrate with dry, scaly skin
Extinct
No longer existing on earth
Predict
A guess
Glaciers
A large slow moving mass of ice
Algae
?