Across
1
Natural satellite of Earth
4
Smallest unit of an element
5
Tissue that contracts for movement
6
Mass per unit volume
7
Gas form of a liquid
11
Compound containing oxygen
Down
2
Particle of light
3
Absolute temperature scale unit
4
Substance with pH below 7
8
Ball of burning gas in space
9
Reddish electrical conductor
10
Infectious microscopic agent