Across
1
Amplified beam of light
4
Form of thermal energy
5
Unit of energy
6
Naturally occurring inorganic solid
7
Particle of light
11
Ball of burning gas in space
Down
2
Basic unit of life
3
Hottest planet in solar system
7
Glass that splits light into spectrum
8
Nerve cell in the brain
9
Substance with pH below 7
10
Biological catalyst