Across
1
Blocking of light by a celestial body
5
Infectious microscopic agent
6
Unit of force
7
Biological catalyst
8
The Red Planet
9
Push or pull on an object
11
Substance with pH below 7
Down
2
Fourth state of matter
3
Naturally occurring inorganic solid
4
Compound containing oxygen
10
Curved glass that refracts light
12
Tissue that contracts for movement