Across
1
Nerve cell in the brain
5
Mass per unit volume
6
Compound containing oxygen
11
Precious yellow metallic element
Down
2
Absolute temperature scale unit
3
Group of similar cells
4
Path of a planet around the sun
7
Natural satellite of Earth
8
Icy body with a tail near the sun
9
Center of an atom or cell
10
Glass that splits light into spectrum