Across
1
Icy body with a tail near the sun
4
Substance with pH below 7
6
Blocking of light by a celestial body
8
Chemical element in table salt
9
Magnetic metallic element
Down
2
Substance with pH above 7
3
Push or pull on an object
5
Precious yellow metallic element
7
Basic unit of life
10
Molten rock beneath Earth surface
11
Compound containing oxygen