Across
1
Absolute temperature scale unit
5
Fourth state of matter
6
Element found in all living things
7
Icy body with a tail near the sun
9
Compound containing oxygen
11
Curved glass that refracts light
Down
2
Push or pull on an object
3
Unit of electric potential
4
Positive particle in nucleus
6
Basic unit of life
8
Mass per unit volume
10
Disturbance that transfers energy
12
Reddish electrical conductor