Across
1
Molten rock beneath Earth surface
3
Unit of electric potential
6
Gas essential for breathing
7
Tissue that contracts for movement
8
Fourth state of matter
9
Unit of force
10
Curved glass that refracts light
Down
2
Icy body with a tail near the sun
3
Hottest planet in solar system
4
Chemical element in table salt
5
Unit of heredity
11
Ball of burning gas in space