Across
1
Unit of heredity
4
Icy body with a tail near the sun
6
Infectious microscopic agent
8
Unit of force
9
Disturbance that transfers energy
10
Amplified beam of light
11
Chemical element in table salt
Down
2
Curved glass that refracts light
3
Tissue that contracts for movement
5
Unit of electric potential
7
Second lightest element
12
Substance with pH above 7
13
Preserved remains of ancient life