Across
1
Unit of force
3
Force that attracts objects together
5
Particle of light
6
Substance with pH below 7
7
Smallest unit of an element
11
Absolute temperature scale unit
Down
2
Gas form of a liquid
4
Naturally occurring inorganic solid
5
Tectonic landmass section
8
Positive particle in nucleus
9
Mass per unit volume
10
Molten rock beneath Earth surface