Across
1
Substance with pH below 7
2
Tectonic landmass section
3
Substance with pH above 7
5
The Red Planet
6
Solid with repeating atomic pattern
7
Group of similar cells
9
Particle of light
Down
2
Fourth state of matter
4
Form of thermal energy
5
Measure of matter in an object
6
Element found in all living things
8
Unit of energy
10
Icy body with a tail near the sun