Across
1
Gas essential for breathing
3
Glass that splits light into spectrum
4
Substance with pH above 7
6
Infectious microscopic agent
7
Gas form of a liquid
11
Unit of electric potential
12
Element found in all living things
Down
2
Unit of energy
3
Particle of light
5
The Red Planet
8
Molten rock beneath Earth surface
9
Magnetic metallic element
10
Ball of burning gas in space