Across
1
Force that attracts objects together
4
Basic unit of life
5
Push or pull on an object
6
Center of an atom or cell
9
Natural satellite of Earth
10
Nerve cell in the brain
11
Unit of power
Down
2
Infectious microscopic agent
3
Compound containing oxygen
7
Gas form of a liquid
8
Hottest planet in solar system
9
Naturally occurring inorganic solid
12
Form of thermal energy