Across
1
Nerve cell in the brain
4
Substance with pH below 7
6
Compound containing oxygen
11
Tectonic landmass section
12
Basic unit of life
Down
2
Magnetic metallic element
3
Biological catalyst
5
Glass that splits light into spectrum
7
Amplified beam of light
8
Mass per unit volume
9
Reddish electrical conductor
10
Blocking of light by a celestial body