Across
1
Substance with pH below 7
4
Basic unit of life
5
Reddish electrical conductor
7
Amplified beam of light
10
Naturally occurring inorganic solid
12
Group of similar cells
Down
2
Fourth state of matter
3
Blocking of light by a celestial body
6
Push or pull on an object
8
Magnetic metallic element
9
Glass that splits light into spectrum
11
Form of thermal energy