Across
1
Natural satellite of Earth
2
Precious yellow metallic element
3
Reddish electrical conductor
4
Second lightest element
5
Fourth state of matter
9
Blocking of light by a celestial body
10
Group of similar cells
Down
1
Naturally occurring inorganic solid
2
Unit of heredity
4
Form of thermal energy
6
Positive particle in nucleus
7
Tectonic landmass section
8
Icy body with a tail near the sun