Across
1
Unit of electric potential
3
Glass that splits light into spectrum
4
Natural satellite of Earth
6
Group of similar cells
7
Precious yellow metallic element
8
Nerve cell in the brain
11
Icy body with a tail near the sun
Down
2
Tissue that contracts for movement
3
Particle of light
5
Center of an atom or cell
9
Positive particle in nucleus
10
Path of a planet around the sun