Across
1
Nerve cell in the brain
3
Substance with pH below 7
5
Tissue that contracts for movement
7
Ball of burning gas in space
10
Hottest planet in solar system
Down
1
Center of an atom or cell
2
Preserved remains of ancient life
4
Push or pull on an object
6
Second lightest element
8
Element found in all living things
9
Substance with pH above 7