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Periods are divided in to ____?
Paleozoic Era
Periods
relative age
Epochs
Cenozoic Era
Petrified
Mold
Cast
A ___________ fossil forms when sediments bury an organism and the sediments cange to rock; the organism decays leaving a cavity in the shape of the organism.
Paleozoic Era
Periods
relative age
Epochs
Cenozoic Era
Petrified
Mold
Cast
A _____________fossil forms when a mold is filled with sand or mud that hardens into the shape of the organism.
Paleozoic Era
Periods
relative age
Epochs
Cenozoic Era
Petrified
Mold
Cast
A_____________ fossil forms when minerals soak into te burried remaiins,replacing the remains,and changing them into rock.
Paleozoic Era
Periods
relative age
Epochs
Cenozoic Era
Petrified
Mold
Cast
Eras are divided into_________.
Paleozoic Era
Periods
relative age
Epochs
Cenozoic Era
Petrified
Mold
Cast
Which Era did human first aappear in?
Paleozoic Era
Periods
relative age
Epochs
Cenozoic Era
Petrified
Mold
Cast
Which Era did the first amphbians appear in?
Paleozoic Era
Periods
relative age
Epochs
Cenozoic Era
Petrified
Mold
Cast
The age of one object compared to the age of another object is called?
Paleozoic Era
Periods
relative age
Epochs
Cenozoic Era
Petrified
Mold
Cast
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