Across
1
Naturally occurring inorganic solid
3
Force that attracts objects together
5
Gas form of a liquid
7
Unit of energy
8
Particle of light
Down
2
Preserved remains of ancient life
3
Precious yellow metallic element
4
Mass per unit volume
6
Substance with pH above 7
8
Positive particle in nucleus
9
Curved glass that refracts light
10
Element found in all living things