Across
1
Preserved remains of ancient life
2
Glass that splits light into spectrum
4
Basic unit of life
5
Nerve cell in the brain
6
Particle of light
7
Center of an atom or cell
10
Substance with pH below 7
11
Push or pull on an object
Down
2
Positive particle in nucleus
3
Chemical element in table salt
4
Reddish electrical conductor
8
Naturally occurring inorganic solid
9
Absolute temperature scale unit