Across
1
Unit of electric potential
3
Compound containing oxygen
5
Tissue that contracts for movement
6
Positive particle in nucleus
Down
2
Absolute temperature scale unit
4
Group of similar cells
5
Molten rock beneath Earth surface
7
Element found in all living things
8
Preserved remains of ancient life
9
Substance with pH below 7
10
Mass per unit volume
11
Gas essential for breathing