Across
1
Ball of burning gas in space
2
Solid with repeating atomic pattern
4
Fourth state of matter
5
Biological catalyst
6
Mass per unit volume
10
Substance with pH below 7
Down
2
Icy body with a tail near the sun
3
Force that attracts objects together
7
Measure of matter in an object
8
Absolute temperature scale unit
9
Molten rock beneath Earth surface