Across
1
Reddish electrical conductor
4
Group of similar cells
6
Naturally occurring inorganic solid
8
Particle of light
11
Substance with pH below 7
Down
2
Tectonic landmass section
3
Second lightest element
5
Path of a planet around the sun
7
Form of thermal energy
9
Glass that splits light into spectrum
10
Gas form of a liquid