Across
1
Glass that splits light into spectrum
4
Unit of force
5
Center of an atom or cell
8
Preserved remains of ancient life
9
Fourth state of matter
11
Absolute temperature scale unit
Down
1
Particle of light
2
Amplified beam of light
3
Mass per unit volume
6
Second lightest element
7
Icy body with a tail near the sun
10
Infectious microscopic agent
12
Push or pull on an object