Across
1
Chemical element in table salt
4
Tectonic landmass section
7
Substance with pH above 7
8
Element found in all living things
9
Gas essential for breathing
10
The Red Planet
Down
2
Substance with pH below 7
3
Preserved remains of ancient life
5
Unit of force
6
Natural satellite of Earth
11
Curved glass that refracts light
12
Particle of light
13
Force that attracts objects together
14
Gas form of a liquid