Across
1
Hottest planet in solar system
3
Naturally occurring inorganic solid
6
Positive particle in nucleus
7
Path of a planet around the sun
8
Fourth state of matter
9
Curved glass that refracts light
10
Gas form of a liquid
Down
2
Amplified beam of light
3
The Red Planet
4
Nerve cell in the brain
5
Center of an atom or cell
6
Tectonic landmass section