Across
1
Form of thermal energy
3
Tissue that contracts for movement
4
Fourth state of matter
7
Chemical element in table salt
9
Absolute temperature scale unit
11
Substance with pH below 7
12
Blocking of light by a celestial body
Down
2
Icy body with a tail near the sun
3
Naturally occurring inorganic solid
5
Molten rock beneath Earth surface
6
Reddish electrical conductor
8
Compound containing oxygen
10
Unit of heredity