Across
1
Gas essential for breathing
3
Amplified beam of light
6
Solid with repeating atomic pattern
7
Unit of energy
8
Nerve cell in the brain
10
Glass that splits light into spectrum
12
Our home planet
Down
2
Hottest planet in solar system
4
Biological catalyst
5
Natural satellite of Earth
9
Fourth state of matter
11
Curved glass that refracts light
13
Path of a planet around the sun