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

Based on their location in the atmosphere, the layers are able to have their own special characteristics. for example, most weather occurs in the troposphere. what occurs in each of the other layers?

What volcanoes form on a divergent plate margin

Which component of a milankovitch cycle is related to periodic ice ages throughout earth’s history?