Across
1
Substance with pH below 7
3
Unit of power
4
Nerve cell in the brain
6
Form of thermal energy
9
Preserved remains of ancient life
11
Unit of electric potential
12
Curved glass that refracts light
Down
2
Solid with repeating atomic pattern
5
Unit of force
7
Amplified beam of light
8
Naturally occurring inorganic solid
10
Magnetic metallic element