Across
1
Compound containing oxygen
3
Molten rock beneath Earth surface
8
Chemical element in table salt
9
Blocking of light by a celestial body
12
Particle of light
Down
2
Second lightest element
4
Natural satellite of Earth
5
Ball of burning gas in space
6
Disturbance that transfers energy
7
Unit of heredity
10
Amplified beam of light
11
The Red Planet