Across
1
Amplified beam of light
4
Icy body with a tail near the sun
6
Element found in all living things
7
Reddish electrical conductor
9
Precious yellow metallic element
11
Center of an atom or cell
Down
2
Magnetic metallic element
3
Naturally occurring inorganic solid
5
Preserved remains of ancient life
8
Molten rock beneath Earth surface
9
Unit of heredity
10
Smallest unit of an element