Across
1
Amplified beam of light
2
Push or pull on an object
4
Curved glass that refracts light
6
Infectious microscopic agent
7
Unit of power
8
Compound containing oxygen
9
Fourth state of matter
Down
2
Preserved remains of ancient life
3
Form of thermal energy
5
Basic unit of life
6
Gas form of a liquid
10
Mass per unit volume