Across
1
Ball of burning gas in space
2
Compound containing oxygen
5
Fourth state of matter
6
Smallest unit of an element
7
Force that attracts objects together
10
Second lightest element
Down
1
Chemical element in table salt
2
Path of a planet around the sun
3
Infectious microscopic agent
4
Substance with pH above 7
8
Tissue that contracts for movement
9
Molten rock beneath Earth surface