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Science Crossword puzzle

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