Across
1
Force that attracts objects together
4
Naturally occurring inorganic solid
7
Tectonic landmass section
8
Gas essential for breathing
11
Gas form of a liquid
Down
2
Smallest unit of an element
3
Unit of electric potential
5
Ball of burning gas in space
6
Measure of matter in an object
7
Positive particle in nucleus
9
Curved glass that refracts light
10
Form of thermal energy