Across
1
Preserved remains of ancient life
4
Molten rock beneath Earth surface
5
Fourth state of matter
9
Positive particle in nucleus
11
Unit of heredity
Down
2
Substance with pH below 7
3
Smallest unit of an element
6
Glass that splits light into spectrum
7
Naturally occurring inorganic solid
8
Reddish electrical conductor
10
Amplified beam of light