Across
1
Compound containing oxygen
3
Biological catalyst
6
Glass that splits light into spectrum
7
Molten rock beneath Earth surface
8
Form of thermal energy
Down
1
Path of a planet around the sun
2
Unit of heredity
4
Substance with pH below 7
5
Icy body with a tail near the sun
6
Positive particle in nucleus
9
Chemical element in table salt