Across
1
Substance with pH below 7
3
Center of an atom or cell
4
Curved glass that refracts light
6
Unit of electric potential
Down
2
Group of similar cells
3
Unit of force
5
Preserved remains of ancient life
7
Icy body with a tail near the sun
Substance with pH below 7
Center of an atom or cell
Curved glass that refracts light
Unit of electric potential
Group of similar cells
Unit of force
Preserved remains of ancient life
Icy body with a tail near the sun