Across
1
Naturally occurring inorganic solid
3
Disturbance that transfers energy
4
Particle of light
11
Reddish electrical conductor
12
Unit of heredity
13
Infectious microscopic agent
Down
2
Gas form of a liquid
5
Blocking of light by a celestial body
6
Unit of energy
7
Fourth state of matter
8
Preserved remains of ancient life
9
Biological catalyst
10
Substance with pH above 7