Across
1
Chemical element in table salt
3
Reddish electrical conductor
4
Disturbance that transfers energy
7
Ball of burning gas in space
8
Unit of electric potential
9
Amplified beam of light
10
Natural satellite of Earth
Down
2
Infectious microscopic agent
5
Unit of force
6
Center of an atom or cell
9
Curved glass that refracts light
10
Molten rock beneath Earth surface
11
Positive particle in nucleus