Across
1
The Red Planet
3
Gas essential for breathing
6
Absolute temperature scale unit
8
Substance with pH above 7
10
Gas form of a liquid
Down
2
Magnetic metallic element
4
Biological catalyst
5
Smallest unit of an element
7
Positive particle in nucleus
9
Tissue that contracts for movement
11
Tectonic landmass section
12
Compound containing oxygen