Across
1
Gas form of a liquid
3
Basic unit of life
4
Positive particle in nucleus
5
Group of similar cells
6
Substance with pH above 7
10
Gas essential for breathing
Down
2
Naturally occurring inorganic solid
4
Glass that splits light into spectrum
7
Unit of energy
8
Ball of burning gas in space
9
Natural satellite of Earth
11
Hottest planet in solar system