Across
1
Substance with pH below 7
4
Unit of force
6
Positive particle in nucleus
7
Unit of power
9
Infectious microscopic agent
12
Push or pull on an object
Down
2
Tectonic landmass section
3
Mass per unit volume
5
Reddish electrical conductor
8
Group of similar cells
10
Smallest unit of an element
11
Nerve cell in the brain