Across
1
Naturally occurring inorganic solid
4
Smallest unit of an element
7
Unit of force
8
Absolute temperature scale unit
10
Magnetic metallic element
12
Group of similar cells
13
Infectious microscopic agent
Down
2
Icy body with a tail near the sun
3
Substance with pH below 7
5
Biological catalyst
6
Path of a planet around the sun
9
Positive particle in nucleus
11
Basic unit of life