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Answer Key
Grade 7 Science: Earth History & Geologic Time Awareness
1.
Strata
2.
older
3.
Fossils
4.
years/numbers
5.
index
6.
history
7.
layer/strata
8.
layers/water or land
9.
in undisturbed rock, lower layers are older than layers above them
10.
preserved remain or trace of an organism from the past
11.
age compared to other rocks or events, not exact years
12.
fossil from a short-lived widespread species used to date layers
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