Across
1
Substance with pH below 7
3
Hottest planet in solar system
4
Our home planet
6
Preserved remains of ancient life
7
Path of a planet around the sun
8
Fourth state of matter
Down
2
Compound containing oxygen
4
Blocking of light by a celestial body
5
Solid with repeating atomic pattern
9
Natural satellite of Earth
10
Tissue that contracts for movement