Across
1
Blocking of light by a celestial body
5
Form of thermal energy
7
Naturally occurring inorganic solid
8
Tissue that contracts for movement
9
Infectious microscopic agent
11
Absolute temperature scale unit
12
Solid with repeating atomic pattern
13
Substance with pH above 7
Down
2
Unit of heredity
3
Our home planet
4
Fourth state of matter
6
The Red Planet
10
Biological catalyst