Across
1
Positive particle in nucleus
3
Natural satellite of Earth
5
Disturbance that transfers energy
7
Ball of burning gas in space
8
Solid with repeating atomic pattern
10
Naturally occurring inorganic solid
Down
2
Center of an atom or cell
3
The Red Planet
4
Group of similar cells
6
Gas form of a liquid
9
Substance with pH below 7
11
Force that attracts objects together