Across
1
Glass that splits light into spectrum
2
Nerve cell in the brain
4
Unit of electric potential
7
The Red Planet
8
Substance with pH below 7
9
Blocking of light by a celestial body
Down
2
Center of an atom or cell
3
Element found in all living things
5
Disturbance that transfers energy
6
Precious yellow metallic element
10
Fourth state of matter
11
Biological catalyst