Across
1
Glass that splits light into spectrum
4
Basic unit of life
6
Force that attracts objects together
8
Naturally occurring inorganic solid
9
Natural satellite of Earth
10
The Red Planet
12
Positive particle in nucleus
Down
2
Center of an atom or cell
3
Reddish electrical conductor
5
Precious yellow metallic element
7
Infectious microscopic agent
11
Biological catalyst