Across
1
Molten rock beneath Earth surface
4
Compound containing oxygen
6
Positive particle in nucleus
8
Precious yellow metallic element
10
Unit of electric potential
13
Amplified beam of light
Down
2
Chemical element in table salt
3
Unit of power
5
Smallest unit of an element
7
Ball of burning gas in space
9
Tectonic landmass section
11
Absolute temperature scale unit
12
Force that attracts objects together