Across
1
Tissue that contracts for movement
4
Push or pull on an object
5
Substance with pH below 7
6
Path of a planet around the sun
10
Reddish electrical conductor
12
Glass that splits light into spectrum
Down
2
Basic unit of life
3
Icy body with a tail near the sun
4
Preserved remains of ancient life
7
Naturally occurring inorganic solid
8
The Red Planet
9
Unit of energy
11
Infectious microscopic agent