Across
1
Mass per unit volume
4
Element found in all living things
6
Measure of matter in an object
9
Molten rock beneath Earth surface
10
Basic unit of life
11
Disturbance that transfers energy
Down
2
Blocking of light by a celestial body
3
Positive particle in nucleus
5
Naturally occurring inorganic solid
7
Biological catalyst
8
Unit of force