Across
1
Naturally occurring inorganic solid
3
Particle of light
5
Tectonic landmass section
6
Unit of energy
7
Measure of matter in an object
9
Precious yellow metallic element
Down
1
Molten rock beneath Earth surface
2
Gas essential for breathing
4
Gas form of a liquid
5
Positive particle in nucleus
8
Blocking of light by a celestial body
10
Biological catalyst