Across
1
Gas essential for breathing
3
Fourth state of matter
6
Ball of burning gas in space
7
Curved glass that refracts light
Down
2
Unit of energy
4
Tissue that contracts for movement
5
Natural satellite of Earth
8
Path of a planet around the sun
Gas essential for breathing
Fourth state of matter
Ball of burning gas in space
Curved glass that refracts light
Unit of energy
Tissue that contracts for movement
Natural satellite of Earth
Path of a planet around the sun