Across
1
Substance with pH below 7
3
Unit of force
5
Push or pull on an object
7
Smallest unit of an element
9
Element found in all living things
10
Substance with pH above 7
14
Basic unit of life
Down
2
Unit of power
4
Gas essential for breathing
6
Precious yellow metallic element
8
Center of an atom or cell
11
Natural satellite of Earth
12
Tissue that contracts for movement
13
Biological catalyst