Across
1
Icy body with a tail near the sun
3
Substance with pH above 7
4
Blocking of light by a celestial body
5
Tectonic landmass section
7
Unit of force
8
Precious yellow metallic element
Down
1
Solid with repeating atomic pattern
2
Fourth state of matter
6
Compound containing oxygen
7
Nerve cell in the brain
9
Push or pull on an object