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Science Crossword puzzle

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Across
2
Physical action or movement
5
The resistance one object gets while going over another
7
A record of geologic changes since the beginning of time.
9
A disturbance in matter that transfers energy through matter
11
Remains or impression of a prehistoric organism
12
Bookmarks in the fossil record
13
Relative dates of past events
Down
1
Determining the exact age of a fossil in the fossil record
3
A force that attracts a body toward another physical body
4
When different organisms from different species begin to develop
6
A record of fossils since the beginning of time
8
The matter waves travel through
10
A long and distinct period of time