Across
1
Fourth state of matter
3
Center of an atom or cell
5
Unit of power
9
Compound containing oxygen
11
Amplified beam of light
Down
1
Particle of light
2
Element found in all living things
4
The Red Planet
6
Icy body with a tail near the sun
7
Hottest planet in solar system
8
Form of thermal energy
10
Tissue that contracts for movement