Across
1
Substance with pH above 7
3
Chemical element in table salt
7
Element found in all living things
8
Center of an atom or cell
9
Form of thermal energy
12
Tissue that contracts for movement
Down
2
Measure of matter in an object
4
Tectonic landmass section
5
Mass per unit volume
6
Smallest unit of an element
10
Unit of force
11
Blocking of light by a celestial body