Across
1
Push or pull on an object
3
Glass that splits light into spectrum
5
Naturally occurring inorganic solid
6
Tectonic landmass section
9
Hottest planet in solar system
10
Preserved remains of ancient life
12
Force that attracts objects together
Down
2
Ball of burning gas in space
4
Compound containing oxygen
7
Measure of matter in an object
8
Substance with pH above 7
9
Unit of electric potential
11
The Red Planet