Across
1
Positive particle in nucleus
4
Substance with pH below 7
5
Curved glass that refracts light
6
Natural satellite of Earth
9
Absolute temperature scale unit
11
Our home planet
13
Hottest planet in solar system
14
Chemical element in table salt
Down
1
Fourth state of matter
2
Gas form of a liquid
3
Naturally occurring inorganic solid
7
Form of thermal energy
8
Nerve cell in the brain
10
Basic unit of life
12
Center of an atom or cell