Across
1
Compound containing oxygen
3
Amplified beam of light
7
Unit of power
9
Unit of energy
12
Fourth state of matter
Down
2
Tectonic landmass section
4
Ball of burning gas in space
5
Solid with repeating atomic pattern
6
Unit of electric potential
8
Group of similar cells
10
Positive particle in nucleus
11
Reddish electrical conductor