Across
1
Glass that splits light into spectrum
4
Positive particle in nucleus
6
Biological catalyst
7
Natural satellite of Earth
10
Curved glass that refracts light
Down
2
Path of a planet around the sun
3
Icy body with a tail near the sun
5
Magnetic metallic element
8
Unit of electric potential
9
Tectonic landmass section
11
Nerve cell in the brain
12
Hottest planet in solar system