Across
1
Basic unit of life
3
Molten rock beneath Earth surface
4
Push or pull on an object
8
Mass per unit volume
9
Nerve cell in the brain
10
Absolute temperature scale unit
11
Unit of power
Down
2
Biological catalyst
5
Gas form of a liquid
6
Ball of burning gas in space
7
Gas essential for breathing
12
Curved glass that refracts light
13
Preserved remains of ancient life
14
Solid with repeating atomic pattern