Across
1
Ball of burning gas in space
3
Mass per unit volume
4
Measure of matter in an object
7
Absolute temperature scale unit
8
Natural satellite of Earth
9
Gas form of a liquid
11
Preserved remains of ancient life
13
Amplified beam of light
14
Unit of force
Down
1
Chemical element in table salt
2
Naturally occurring inorganic solid
5
Particle of light
6
Fourth state of matter
10
Biological catalyst
12
Compound containing oxygen