Across
1
Molten rock beneath Earth surface
3
Infectious microscopic agent
5
Smallest unit of an element
6
Center of an atom or cell
9
Ball of burning gas in space
Down
2
Solid with repeating atomic pattern
4
Fourth state of matter
7
Unit of electric potential
8
The Red Planet
10
Substance with pH below 7
11
Hottest planet in solar system