Across
1
Reddish electrical conductor
4
Preserved remains of ancient life
5
Disturbance that transfers energy
8
Substance with pH below 7
9
Nerve cell in the brain
11
Particle of light
12
Glass that splits light into spectrum
Down
2
Gas form of a liquid
3
Infectious microscopic agent
6
Unit of heredity
7
Chemical element in table salt
10
Amplified beam of light
11
Positive particle in nucleus