Across
1
Substance with pH below 7
4
Form of thermal energy
5
Preserved remains of ancient life
9
Gas form of a liquid
11
Ball of burning gas in space
12
Substance with pH above 7
Down
2
Unit of power
3
Compound containing oxygen
6
Measure of matter in an object
7
Precious yellow metallic element
8
Unit of energy
10
Naturally occurring inorganic solid