Across
1
Substance with pH below 7
2
Compound containing oxygen
6
Biological catalyst
7
Tectonic landmass section
8
Unit of energy
Down
2
Path of a planet around the sun
3
Substance with pH above 7
4
Blocking of light by a celestial body
5
Glass that splits light into spectrum
9
Push or pull on an object
10
Form of thermal energy