Across
1
Element found in all living things
4
Unit of energy
5
Tissue that contracts for movement
8
Particle of light
10
The Red Planet
Down
2
Amplified beam of light
3
Chemical element in table salt
6
Natural satellite of Earth
7
Fourth state of matter
8
Positive particle in nucleus
9
Path of a planet around the sun
11
Hottest planet in solar system