Across
1
Fourth state of matter
4
Center of an atom or cell
8
Natural satellite of Earth
9
Disturbance that transfers energy
10
Unit of force
11
Mass per unit volume
Down
1
Tectonic landmass section
2
Basic unit of life
3
Substance with pH above 7
5
Substance with pH below 7
6
Hottest planet in solar system
7
Icy body with a tail near the sun