Density is defined as:

a. layers that are separated.
b. the speed at which a liquid moves.
c. the weight of a substance.
d. the mass per unit of volume.


ANS: D
Density is the measurement of mass per unit of volume. It is an expression of the relative heaviness of
a substance. Information can be found in the section Earth's Interior Is Layered.

Environmental & Atmospheric Sciences

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