Across
1
Positive particle in nucleus
4
Compound containing oxygen
6
Tectonic landmass section
7
Hottest planet in solar system
8
Gas essential for breathing
Down
2
Center of an atom or cell
3
Push or pull on an object
5
Icy body with a tail near the sun
7
Infectious microscopic agent
9
Molten rock beneath Earth surface
10
Natural satellite of Earth
11
Gas form of a liquid