Across
1
Unit of electric potential
4
Gas essential for breathing
5
Smallest unit of an element
10
Molten rock beneath Earth surface
11
Hottest planet in solar system
Down
2
Ball of burning gas in space
3
Natural satellite of Earth
6
Blocking of light by a celestial body
7
Fourth state of matter
8
Solid with repeating atomic pattern
9
Element found in all living things