Across
1
Chemical element in table salt
3
Nerve cell in the brain
4
Icy body with a tail near the sun
7
Solid with repeating atomic pattern
Down
2
Molten rock beneath Earth surface
3
Center of an atom or cell
5
Natural satellite of Earth
6
Substance with pH below 7
8
Fourth state of matter
9
Glass that splits light into spectrum
10
Positive particle in nucleus