Across
1
Particle of light
4
Unit of heredity
5
Icy body with a tail near the sun
7
Gas essential for breathing
9
Disturbance that transfers energy
10
Unit of electric potential
11
Infectious microscopic agent
12
Tectonic landmass section
13
Unit of force
Down
2
Unit of energy
3
Push or pull on an object
6
Absolute temperature scale unit
7
Compound containing oxygen
8
Blocking of light by a celestial body