Across
1
Curved glass that refracts light
4
Substance with pH above 7
5
Naturally occurring inorganic solid
6
Gas form of a liquid
8
Chemical element in table salt
Down
2
Precious yellow metallic element
3
Blocking of light by a celestial body
6
Unit of electric potential
7
Infectious microscopic agent
9
Center of an atom or cell
10
Magnetic metallic element
11
Natural satellite of Earth