Across
1
The Red Planet
4
Unit of electric potential
5
Compound containing oxygen
7
Naturally occurring inorganic solid
9
Nerve cell in the brain
11
Our home planet
12
Blocking of light by a celestial body
Down
2
Unit of power
3
Chemical element in table salt
4
Gas form of a liquid
6
Substance with pH below 7
8
Second lightest element
10
Basic unit of life