Across
1
Force that attracts objects together
3
Fourth state of matter
7
Substance with pH above 7
8
Icy body with a tail near the sun
10
Disturbance that transfers energy
11
Tissue that contracts for movement
Down
2
Glass that splits light into spectrum
4
Reddish electrical conductor
5
Mass per unit volume
6
Smallest unit of an element
9
Tectonic landmass section
12
Basic unit of life