Across
1
Measure of matter in an object
3
Mass per unit volume
5
Group of similar cells
8
Form of thermal energy
11
Naturally occurring inorganic solid
13
Reddish electrical conductor
Down
2
Preserved remains of ancient life
4
Compound containing oxygen
6
Infectious microscopic agent
7
Smallest unit of an element
9
Disturbance that transfers energy
10
Fourth state of matter
12
Particle of light