Across
1
Tectonic landmass section
3
Unit of electric potential
4
Path of a planet around the sun
5
Disturbance that transfers energy
6
Reddish electrical conductor
8
Ball of burning gas in space
12
Curved glass that refracts light
Down
1
Glass that splits light into spectrum
2
Naturally occurring inorganic solid
3
Hottest planet in solar system
7
Positive particle in nucleus
9
Group of similar cells
10
Our home planet
11
Particle of light