Across
1
Blocking of light by a celestial body
5
Gas form of a liquid
6
Basic unit of life
7
Element found in all living things
10
Preserved remains of ancient life
Down
2
Substance with pH above 7
3
Center of an atom or cell
4
Biological catalyst
5
Hottest planet in solar system
8
Naturally occurring inorganic solid
9
Particle of light