Across
1
Tissue that contracts for movement
3
Positive particle in nucleus
4
Unit of electric potential
7
Substance with pH below 7
8
Naturally occurring inorganic solid
9
Reddish electrical conductor
Down
2
Amplified beam of light
5
Group of similar cells
6
Center of an atom or cell
10
Unit of power
11
Absolute temperature scale unit
12
Tectonic landmass section
13
Path of a planet around the sun