Across
1
Precious yellow metallic element
2
Biological catalyst
3
Chemical element in table salt
6
Preserved remains of ancient life
8
Smallest unit of an element
Down
2
Blocking of light by a celestial body
4
Measure of matter in an object
5
Naturally occurring inorganic solid
7
Molten rock beneath Earth surface
9
Natural satellite of Earth
10
Center of an atom or cell