Across
1
Amplified beam of light
4
Curved glass that refracts light
5
Unit of electric potential
7
Compound containing oxygen
10
Disturbance that transfers energy
11
Group of similar cells
Down
2
Unit of heredity
3
Tectonic landmass section
6
Icy body with a tail near the sun
8
Ball of burning gas in space
9
Precious yellow metallic element