Across
1
Path of a planet around the sun
2
Hottest planet in solar system
3
Unit of force
4
Push or pull on an object
7
Amplified beam of light
8
Substance with pH below 7
9
Measure of matter in an object
Down
2
Gas form of a liquid
3
Nerve cell in the brain
5
The Red Planet
6
Group of similar cells
10
Element found in all living things