Across
1
Glass that splits light into spectrum
4
Center of an atom or cell
5
Compound containing oxygen
6
Substance with pH above 7
9
Form of thermal energy
Down
2
Infectious microscopic agent
3
Hottest planet in solar system
5
Gas essential for breathing
7
Ball of burning gas in space
8
Molten rock beneath Earth surface
10
Our home planet
11
Mass per unit volume