Sand or gravel that naturally forms near earth's surface is known as
a. pollen.
b. aggregate.
c. ore.
d. bedrock.

B. Aggregate. Stone, gravel, and other bits of crushed rock are known as the 'aggregate' in Earth Science, as they are made up of the aggregation of extraneous bits of stone. They are a nonrenewable resource which we rarely think about, but which is utilized for a number of different industries and day-to-activities. It can be man made as well as naturally occurring.

Ibelieve the answer is c

The answer is the magnetosphere.