Across
1
Substance with pH above 7
3
Natural satellite of Earth
4
Naturally occurring inorganic solid
5
Amplified beam of light
7
Gas essential for breathing
9
Fourth state of matter
Down
2
Element found in all living things
4
Measure of matter in an object
6
Unit of energy
8
Icy body with a tail near the sun
9
Tectonic landmass section
10
The Red Planet
11
Force that attracts objects together
12
Unit of electric potential