Across
1
Substance with pH below 7
4
Smallest unit of an element
5
Natural satellite of Earth
8
Form of thermal energy
9
Path of a planet around the sun
10
Unit of heredity
11
Unit of power
Down
2
Preserved remains of ancient life
3
Fourth state of matter
6
Tectonic landmass section
7
Unit of force
12
Unit of electric potential
13
Amplified beam of light