Across
1
Reddish electrical conductor
4
Compound containing oxygen
5
Unit of force
9
Substance with pH above 7
10
Infectious microscopic agent
11
Blocking of light by a celestial body
Down
2
Substance with pH below 7
3
Disturbance that transfers energy
6
Unit of electric potential
7
Our home planet
8
Nerve cell in the brain
11
Biological catalyst
12
Preserved remains of ancient life