Across
1
Molten rock beneath Earth surface
3
Positive particle in nucleus
5
Compound containing oxygen
7
Particle of light
9
Natural satellite of Earth
10
The Red Planet
12
Ball of burning gas in space
Down
2
Our home planet
3
Tectonic landmass section
4
Unit of force
6
Form of thermal energy
8
Element found in all living things
11
Curved glass that refracts light