Across
1
Gas form of a liquid
3
Positive particle in nucleus
4
Push or pull on an object
5
Force that attracts objects together
8
Reddish electrical conductor
Down
2
Icy body with a tail near the sun
3
Tectonic landmass section
6
Curved glass that refracts light
7
Group of similar cells
9
Molten rock beneath Earth surface