Across
1
Infectious microscopic agent
4
Unit of force
5
Chemical element in table salt
6
Tectonic landmass section
7
Gas form of a liquid
8
Positive particle in nucleus
Down
2
Mass per unit volume
3
Amplified beam of light
4
Nerve cell in the brain
9
Ball of burning gas in space
10
Icy body with a tail near the sun
11
Substance with pH above 7
12
Hottest planet in solar system
13
Measure of matter in an object