Across
1
Disturbance that transfers energy
3
Icy body with a tail near the sun
4
Smallest unit of an element
6
Unit of heredity
7
Chemical element in table salt
8
Gas form of a liquid
9
Ball of burning gas in space
11
Infectious microscopic agent
Down
2
Mass per unit volume
3
Solid with repeating atomic pattern
5
Molten rock beneath Earth surface
10
Unit of energy