Across
1
Compound containing oxygen
4
Fourth state of matter
6
Particle of light
7
Unit of force
10
Path of a planet around the sun
Down
2
Gas form of a liquid
3
Substance with pH below 7
4
Tectonic landmass section
5
Group of similar cells
8
Magnetic metallic element
9
Reddish electrical conductor
11
Measure of matter in an object