Across
1
Unit of power
2
Icy body with a tail near the sun
3
Gas form of a liquid
4
Amplified beam of light
7
Center of an atom or cell
8
Form of thermal energy
10
Disturbance that transfers energy
Down
2
Solid with repeating atomic pattern
3
Unit of electric potential
5
Positive particle in nucleus
6
Substance with pH above 7
9
Hottest planet in solar system
11
Our home planet