Across
1
Reddish electrical conductor
4
Mass per unit volume
5
Disturbance that transfers energy
8
Glass that splits light into spectrum
9
Unit of electric potential
10
Naturally occurring inorganic solid
Down
2
Nerve cell in the brain
3
Fourth state of matter
6
Particle of light
7
Blocking of light by a celestial body
11
Magnetic metallic element