Across
1
Solid with repeating atomic pattern
5
Substance with pH above 7
6
Molten rock beneath Earth surface
7
Amplified beam of light
9
Unit of electric potential
10
Particle of light
Down
2
Gas form of a liquid
3
Form of thermal energy
4
Fourth state of matter
8
Mass per unit volume
11
Unit of force
12
Gas essential for breathing
13
Smallest unit of an element