Across
1
Blocking of light by a celestial body
5
Hottest planet in solar system
7
Preserved remains of ancient life
11
Naturally occurring inorganic solid
12
Substance with pH below 7
Down
2
Basic unit of life
3
Precious yellow metallic element
4
Absolute temperature scale unit
6
Second lightest element
8
Center of an atom or cell
9
Gas form of a liquid
10
Compound containing oxygen