Across
1
Ball of burning gas in space
5
Mass per unit volume
6
Second lightest element
7
Substance with pH above 7
8
Icy body with a tail near the sun
Down
2
The Red Planet
3
Group of similar cells
4
Push or pull on an object
6
Form of thermal energy
9
Tectonic landmass section
10
Unit of electric potential
11
Fourth state of matter