Across
1
Substance with pH above 7
4
Push or pull on an object
6
Unit of force
8
Element found in all living things
9
Tissue that contracts for movement
11
Path of a planet around the sun
Down
2
Gas essential for breathing
3
Substance with pH below 7
5
Disturbance that transfers energy
7
Blocking of light by a celestial body
10
Unit of electric potential
12
Basic unit of life