Across
1
Natural satellite of Earth
4
Gas form of a liquid
5
Ball of burning gas in space
6
Mass per unit volume
9
Nerve cell in the brain
11
Unit of force
13
Push or pull on an object
Down
2
Precious yellow metallic element
3
Positive particle in nucleus
7
Our home planet
8
Form of thermal energy
10
Naturally occurring inorganic solid
12
Amplified beam of light