Across
1
Hottest planet in solar system
2
Naturally occurring inorganic solid
4
Compound containing oxygen
5
Positive particle in nucleus
8
Substance with pH below 7
9
Absolute temperature scale unit
10
Glass that splits light into spectrum
Down
2
Tissue that contracts for movement
3
Unit of energy
5
Fourth state of matter
6
Form of thermal energy
7
Preserved remains of ancient life