Across
1
Solid with repeating atomic pattern
5
Glass that splits light into spectrum
6
Tectonic landmass section
7
Biological catalyst
11
Nerve cell in the brain
13
Substance with pH above 7
Down
2
Absolute temperature scale unit
3
Unit of electric potential
4
Path of a planet around the sun
8
Substance with pH below 7
9
Mass per unit volume
10
Form of thermal energy
12
Naturally occurring inorganic solid