Across
1
Naturally occurring inorganic solid
2
Compound containing oxygen
6
Particle of light
7
Hottest planet in solar system
8
Absolute temperature scale unit
10
Substance with pH above 7
11
Fourth state of matter
Down
1
The Red Planet
2
Gas essential for breathing
3
Glass that splits light into spectrum
4
Blocking of light by a celestial body
5
Second lightest element
9
Push or pull on an object
12
Tectonic landmass section