Across
1
Center of an atom or cell
3
Push or pull on an object
5
Element found in all living things
6
Biological catalyst
8
Curved glass that refracts light
9
Naturally occurring inorganic solid
Down
1
Nerve cell in the brain
2
Precious yellow metallic element
4
Mass per unit volume
7
Unit of force
10
Icy body with a tail near the sun
11
Glass that splits light into spectrum