Across
1
Naturally occurring inorganic solid
5
Unit of power
6
Path of a planet around the sun
9
Substance with pH below 7
10
Nerve cell in the brain
Down
2
Fourth state of matter
3
Unit of force
4
Solid with repeating atomic pattern
7
Basic unit of life
8
Form of thermal energy
11
Icy body with a tail near the sun