Across
1
Substance with pH below 7
3
Icy body with a tail near the sun
5
Nerve cell in the brain
8
Hottest planet in solar system
9
Unit of electric potential
10
Ball of burning gas in space
11
Positive particle in nucleus
Down
2
Push or pull on an object
4
Unit of energy
6
Absolute temperature scale unit
7
Mass per unit volume