Across
1
Center of an atom or cell
5
Tectonic landmass section
6
Reddish electrical conductor
8
Absolute temperature scale unit
10
Hottest planet in solar system
12
Naturally occurring inorganic solid
Down
2
Second lightest element
3
Amplified beam of light
4
Nerve cell in the brain
6
Icy body with a tail near the sun
7
Unit of electric potential
9
Glass that splits light into spectrum
11
Unit of heredity