Across
1
Nerve cell in the brain
5
Chemical element in table salt
7
Unit of energy
8
Disturbance that transfers energy
Down
2
Amplified beam of light
3
Our home planet
4
Hottest planet in solar system
6
Compound containing oxygen
8
Unit of power
9
Path of a planet around the sun
10
Smallest unit of an element
11
Group of similar cells
12
Unit of force