Across
1
Tectonic landmass section
3
Center of an atom or cell
7
Measure of matter in an object
10
Unit of force
Down
1
Fourth state of matter
2
Biological catalyst
4
Basic unit of life
5
Substance with pH below 7
6
Form of thermal energy
8
Unit of electric potential
9
Mass per unit volume
11
Path of a planet around the sun