Across
1
Molten rock beneath Earth surface
4
Ball of burning gas in space
5
Reddish electrical conductor
7
Absolute temperature scale unit
Down
2
Force that attracts objects together
3
Substance with pH below 7
4
Chemical element in table salt
6
Gas essential for breathing
8
Unit of force
9
Unit of electric potential
10
Positive particle in nucleus
11
Glass that splits light into spectrum