Across
1
Chemical element in table salt
5
Absolute temperature scale unit
6
Substance with pH below 7
7
The Red Planet
9
Element found in all living things
12
Compound containing oxygen
Down
2
Nerve cell in the brain
3
Infectious microscopic agent
4
Naturally occurring inorganic solid
8
Gas essential for breathing
10
Group of similar cells
11
Path of a planet around the sun