Across
1
Naturally occurring inorganic solid
2
Path of a planet around the sun
5
Hottest planet in solar system
7
Particle of light
11
Molten rock beneath Earth surface
Down
2
Gas essential for breathing
3
Blocking of light by a celestial body
4
Ball of burning gas in space
6
Gas form of a liquid
8
Unit of electric potential
9
Second lightest element
10
Natural satellite of Earth
12
Unit of heredity