Across
1
Naturally occurring inorganic solid
5
Mass per unit volume
8
Ball of burning gas in space
9
Tissue that contracts for movement
Down
2
Form of thermal energy
3
Biological catalyst
4
Measure of matter in an object
6
Curved glass that refracts light
7
Precious yellow metallic element
10
Tectonic landmass section
11
Substance with pH below 7