Across
1
Substance with pH below 7
3
Tectonic landmass section
5
Fourth state of matter
6
Biological catalyst
10
Compound containing oxygen
Down
2
Amplified beam of light
4
Smallest unit of an element
5
Glass that splits light into spectrum
7
Blocking of light by a celestial body
8
Nerve cell in the brain
9
Naturally occurring inorganic solid
11
Element found in all living things