Across
1
Form of thermal energy
3
Compound containing oxygen
5
Natural satellite of Earth
8
Amplified beam of light
10
Tissue that contracts for movement
11
Positive particle in nucleus
Down
1
Second lightest element
2
The Red Planet
4
Gas form of a liquid
6
Naturally occurring inorganic solid
7
Curved glass that refracts light
9
Path of a planet around the sun