Across
1
Gas essential for breathing
3
Glass that splits light into spectrum
5
Naturally occurring inorganic solid
6
Substance with pH above 7
10
Our home planet
12
Unit of force
13
Curved glass that refracts light
Down
2
Preserved remains of ancient life
4
Amplified beam of light
7
Unit of energy
8
Fourth state of matter
9
Center of an atom or cell
11
Unit of power
14
Natural satellite of Earth