Across
1
Ball of burning gas in space
3
Natural satellite of Earth
4
Precious yellow metallic element
5
Our home planet
9
Group of similar cells
10
Curved glass that refracts light
11
Second lightest element
Down
2
Molten rock beneath Earth surface
4
Unit of heredity
6
Particle of light
7
Naturally occurring inorganic solid
8
Hottest planet in solar system