Across
1
Molten rock beneath Earth surface
2
Reddish electrical conductor
4
Substance with pH above 7
6
Gas form of a liquid
7
Second lightest element
8
Ball of burning gas in space
Down
1
The Red Planet
2
Icy body with a tail near the sun
3
Fourth state of matter
5
Substance with pH below 7
6
Unit of electric potential