Across
1
Gas essential for breathing
3
Fourth state of matter
5
Icy body with a tail near the sun
8
Substance with pH below 7
9
Positive particle in nucleus
11
Glass that splits light into spectrum
Down
2
Chemical element in table salt
3
Tectonic landmass section
4
Compound containing oxygen
6
Reddish electrical conductor
7
Amplified beam of light
10
Nerve cell in the brain
12
Precious yellow metallic element