Across
1
Our home planet
4
Substance with pH above 7
6
Positive particle in nucleus
7
Hottest planet in solar system
8
Precious yellow metallic element
9
Gas form of a liquid
Down
2
Unit of heredity
3
Reddish electrical conductor
5
Measure of matter in an object
6
Particle of light
10
Nerve cell in the brain
11
Molten rock beneath Earth surface