Across
1
Compound containing oxygen
3
Gas form of a liquid
5
Hottest planet in solar system
7
Tectonic landmass section
8
Our home planet
11
Center of an atom or cell
Down
2
Smallest unit of an element
4
Blocking of light by a celestial body
6
Substance with pH above 7
9
Magnetic metallic element
10
Unit of heredity