Across
1
Nerve cell in the brain
2
Reddish electrical conductor
5
Tectonic landmass section
7
Substance with pH below 7
9
Preserved remains of ancient life
10
Our home planet
12
Unit of energy
Down
2
Element found in all living things
3
Center of an atom or cell
4
Gas form of a liquid
6
Compound containing oxygen
8
Precious yellow metallic element
11
Tissue that contracts for movement