Across
1
Substance with pH below 7
3
Group of similar cells
5
Amplified beam of light
7
The Red Planet
8
Basic unit of life
9
Icy body with a tail near the sun
11
Compound containing oxygen
Down
2
Absolute temperature scale unit
4
Fourth state of matter
6
Unit of power
7
Tissue that contracts for movement
10
Path of a planet around the sun