Across
1
Form of thermal energy
2
Particle of light
3
Element found in all living things
5
Substance with pH above 7
6
Measure of matter in an object
10
Absolute temperature scale unit
Down
2
Fourth state of matter
3
Solid with repeating atomic pattern
4
Path of a planet around the sun
7
Mass per unit volume
8
Gas essential for breathing
9
Magnetic metallic element