Across
1
Molten rock beneath Earth surface
4
Unit of force
5
Particle of light
9
Unit of electric potential
11
Tectonic landmass section
12
Gas form of a liquid
Down
2
Force that attracts objects together
3
Second lightest element
6
Gas essential for breathing
7
Our home planet
8
Natural satellite of Earth
10
Absolute temperature scale unit
13
Element found in all living things