Across
1
Our home planet
4
Gas essential for breathing
5
Positive particle in nucleus
7
Unit of electric potential
8
Molten rock beneath Earth surface
9
Hottest planet in solar system
12
Unit of energy
13
Tectonic landmass section
Down
2
Unit of force
3
Solid with repeating atomic pattern
6
Force that attracts objects together
10
Element found in all living things
11
Center of an atom or cell