Across
1
Positive particle in nucleus
3
Disturbance that transfers energy
4
Glass that splits light into spectrum
7
Icy body with a tail near the sun
11
Naturally occurring inorganic solid
12
Substance with pH below 7
Down
2
Infectious microscopic agent
5
Magnetic metallic element
6
Solid with repeating atomic pattern
8
Path of a planet around the sun
9
The Red Planet
10
Biological catalyst