Across
1
Group of similar cells
2
Unit of power
5
Unit of heredity
7
Gas form of a liquid
9
Push or pull on an object
11
Icy body with a tail near the sun
Down
2
Disturbance that transfers energy
3
Second lightest element
4
Preserved remains of ancient life
6
Molten rock beneath Earth surface
8
Positive particle in nucleus
10
Path of a planet around the sun
12
Solid with repeating atomic pattern