Across
1
Naturally occurring inorganic solid
5
Force that attracts objects together
6
Gas essential for breathing
8
Precious yellow metallic element
9
Particle of light
10
Our home planet
13
Absolute temperature scale unit
Down
2
Positive particle in nucleus
3
Solid with repeating atomic pattern
4
Glass that splits light into spectrum
7
Compound containing oxygen
10
Biological catalyst
11
Unit of electric potential
12
Unit of power