Across
1
Biological catalyst
4
Unit of power
5
Precious yellow metallic element
6
Preserved remains of ancient life
9
Reddish electrical conductor
Down
2
Compound containing oxygen
3
Substance with pH above 7
7
Smallest unit of an element
8
Unit of energy
9
Element found in all living things
10
Fourth state of matter
11
Molten rock beneath Earth surface