Across
1
Molten rock beneath Earth surface
3
Glass that splits light into spectrum
4
Second lightest element
5
Unit of electric potential
7
Unit of power
11
Force that attracts objects together
Down
2
Our home planet
3
Tectonic landmass section
6
Icy body with a tail near the sun
8
Smallest unit of an element
9
Ball of burning gas in space
10
Precious yellow metallic element