Across
1
Unit of electric potential
3
Disturbance that transfers energy
5
Natural satellite of Earth
6
Curved glass that refracts light
7
Mass per unit volume
8
Infectious microscopic agent
9
Icy body with a tail near the sun
Down
2
Smallest unit of an element
4
Group of similar cells
5
Tissue that contracts for movement
10
Form of thermal energy
11
Tectonic landmass section
12
Hottest planet in solar system
13
Nerve cell in the brain