Across
1
Naturally occurring inorganic solid
3
Particle of light
5
Nerve cell in the brain
8
Path of a planet around the sun
9
Natural satellite of Earth
11
Glass that splits light into spectrum
Down
2
Compound containing oxygen
4
Precious yellow metallic element
6
Icy body with a tail near the sun
7
Gas essential for breathing
10
Form of thermal energy