Across
1
Our home planet
4
Natural satellite of Earth
5
Fourth state of matter
7
Unit of heredity
8
Particle of light
9
Biological catalyst
10
Hottest planet in solar system
11
Center of an atom or cell
Down
2
Form of thermal energy
3
Unit of force
6
Substance with pH above 7
8
Glass that splits light into spectrum
12
Icy body with a tail near the sun