Across
1
Gas form of a liquid
4
Basic unit of life
5
Biological catalyst
6
Group of similar cells
9
Molten rock beneath Earth surface
10
Infectious microscopic agent
11
Naturally occurring inorganic solid
Down
2
Substance with pH below 7
3
Amplified beam of light
7
Tectonic landmass section
8
Tissue that contracts for movement
12
Solid with repeating atomic pattern
13
Ball of burning gas in space