Across
1
Gas essential for breathing
4
Gas form of a liquid
5
Amplified beam of light
8
Measure of matter in an object
9
Fourth state of matter
Down
2
Disturbance that transfers energy
3
Nerve cell in the brain
6
Solid with repeating atomic pattern
7
Preserved remains of ancient life
9
Tectonic landmass section
10
Mass per unit volume