Across
1
Nerve cell in the brain
4
Disturbance that transfers energy
5
Icy body with a tail near the sun
9
Solid with repeating atomic pattern
11
Unit of energy
Down
2
Absolute temperature scale unit
3
Path of a planet around the sun
6
Substance with pH below 7
7
Unit of heredity
8
Unit of electric potential
10
Center of an atom or cell