Across
1
Fourth state of matter
3
Disturbance that transfers energy
4
Natural satellite of Earth
5
Preserved remains of ancient life
6
Curved glass that refracts light
7
Form of thermal energy
8
Gas essential for breathing
10
Ball of burning gas in space
Down
1
Particle of light
2
The Red Planet
3
Unit of power
4
Tissue that contracts for movement
9
Biological catalyst