Across
1
Compound containing oxygen
3
Form of thermal energy
5
Gas form of a liquid
6
Unit of heredity
7
Naturally occurring inorganic solid
9
Push or pull on an object
10
Smallest unit of an element
Down
2
Disturbance that transfers energy
4
Positive particle in nucleus
6
Force that attracts objects together
7
The Red Planet
8
Nerve cell in the brain