Across
1
Curved glass that refracts light
3
Unit of power
5
Naturally occurring inorganic solid
6
Basic unit of life
8
Chemical element in table salt
10
Reddish electrical conductor
11
Hottest planet in solar system
Down
2
Ball of burning gas in space
4
Disturbance that transfers energy
6
Solid with repeating atomic pattern
7
Group of similar cells
9
Unit of energy