Across
1
Path of a planet around the sun
4
Form of thermal energy
5
Reddish electrical conductor
6
Gas form of a liquid
8
Compound containing oxygen
Down
2
Push or pull on an object
3
Preserved remains of ancient life
7
Nerve cell in the brain
9
Precious yellow metallic element
10
Substance with pH below 7
11
Molten rock beneath Earth surface