Across
1
Gas essential for breathing
4
Naturally occurring inorganic solid
5
Chemical element in table salt
6
Blocking of light by a celestial body
9
Unit of force
10
Glass that splits light into spectrum
11
Molten rock beneath Earth surface
12
Amplified beam of light
Down
2
Particle of light
3
Second lightest element
5
Ball of burning gas in space
7
Mass per unit volume
8
Push or pull on an object