Across
1
Gas form of a liquid
4
Molten rock beneath Earth surface
6
Hottest planet in solar system
7
Gas essential for breathing
12
Measure of matter in an object
Down
2
Fourth state of matter
3
Positive particle in nucleus
5
Ball of burning gas in space
8
Biological catalyst
9
Absolute temperature scale unit
10
Tissue that contracts for movement
11
Amplified beam of light