Across
1
Absolute temperature scale unit
4
Fourth state of matter
6
Icy body with a tail near the sun
7
Blocking of light by a celestial body
12
Tectonic landmass section
Down
2
Reddish electrical conductor
3
Gas form of a liquid
5
Form of thermal energy
8
Biological catalyst
9
Mass per unit volume
10
Molten rock beneath Earth surface
11
Nerve cell in the brain