Across
1
Compound containing oxygen
5
Amplified beam of light
6
Positive particle in nucleus
10
Ball of burning gas in space
11
Nerve cell in the brain
Down
2
Infectious microscopic agent
3
Element found in all living things
4
Our home planet
7
Unit of power
8
Force that attracts objects together
9
Unit of energy
12
Hottest planet in solar system