Across
1
Nerve cell in the brain
3
Precious yellow metallic element
5
Form of thermal energy
7
Icy body with a tail near the sun
8
Infectious microscopic agent
11
Substance with pH below 7
12
Naturally occurring inorganic solid
Down
2
Absolute temperature scale unit
3
Unit of heredity
4
Blocking of light by a celestial body
6
Push or pull on an object
8
Unit of electric potential
9
Unit of energy
10
Natural satellite of Earth