Across
1
Nerve cell in the brain
3
Tectonic landmass section
5
Unit of heredity
8
Molten rock beneath Earth surface
9
Solid with repeating atomic pattern
11
Gas form of a liquid
12
Glass that splits light into spectrum
Down
2
Mass per unit volume
4
Absolute temperature scale unit
6
Force that attracts objects together
7
Second lightest element
8
The Red Planet
10
Form of thermal energy