My Crossword Maker Logo
Powered by BrightSprout
Save Status:
or to save your progress. The page will not refresh.
Controls:
SPACEBAR SWITCHES TYPING DIRECTION
Answer Key:
Edit a Copy:
Make Your Own:
Crossword Word Search Worksheet
Rate This Puzzle:
Log in or sign up to rate this puzzle.

Crossword Key Terms 6.3

Crossword Key Terms 6.3
Across
A copy of the shape of the organism that made the mold
Used to determined the actual age of fossils
A theory that proposes that evolution occurs slowly but steadily
A theory that accounts for the gaps in the fossil record
Used to determined of which of two fossils is older
No members of the species are still alive
Down
The time it takes for half of the atoms in a sample to decay
The millions of fossils that scientist have collected
Unstable elements that decay or break down into different elements
Minerals replace all of part of an organism
A hollow space in sediment in the shape of an organism