Across
1
Naturally occurring inorganic solid
6
Infectious microscopic agent
8
Substance with pH below 7
9
Amplified beam of light
10
Unit of force
Down
2
Smallest unit of an element
3
Path of a planet around the sun
4
Particle of light
5
Magnetic metallic element
7
Basic unit of life
11
Element found in all living things
12
Substance with pH above 7