Across
1
Particle of light
4
Substance with pH below 7
7
Preserved remains of ancient life
8
Glass that splits light into spectrum
9
Tectonic landmass section
10
Biological catalyst
Down
2
Naturally occurring inorganic solid
3
Force that attracts objects together
5
Chemical element in table salt
6
Blocking of light by a celestial body
11
Infectious microscopic agent
12
Curved glass that refracts light