Across
1
Solid with repeating atomic pattern
5
Compound containing oxygen
6
Fourth state of matter
7
Measure of matter in an object
12
Path of a planet around the sun
Down
1
Icy body with a tail near the sun
2
Molten rock beneath Earth surface
3
Ball of burning gas in space
4
Chemical element in table salt
8
Substance with pH above 7
9
Smallest unit of an element
10
Substance with pH below 7
11
Preserved remains of ancient life