Across
1
Gas form of a liquid
4
Measure of matter in an object
6
Mass per unit volume
7
Glass that splits light into spectrum
9
Reddish electrical conductor
11
Smallest unit of an element
Down
2
Chemical element in table salt
3
Molten rock beneath Earth surface
5
Center of an atom or cell
8
Ball of burning gas in space
10
Icy body with a tail near the sun
12
Preserved remains of ancient life