Across
1
Substance with pH above 7
4
Force that attracts objects together
6
Basic unit of life
8
Molten rock beneath Earth surface
9
Glass that splits light into spectrum
11
Gas form of a liquid
Down
2
Our home planet
3
Compound containing oxygen
5
Amplified beam of light
7
Tectonic landmass section
10
Hottest planet in solar system
12
Disturbance that transfers energy