Map of Waldron, AR: The rings of bedrock in this region are composed of alternating layers of mudstone and quartz-rich sandstone. Which one makes up the ridges (not the valleys)? a. Mudstone

b. Quartz-rich

c. Sandstone granite

d. Schist

b. Quartz-rich

Explanation:

In this map of Waldron, we appreciate ridges and valleys. We also know that the bedrock of the region is composed of mudstone and quartz-rich sandstone. The ridges are the ones that compose mountains, such as the Ouachita Mountains. The reason why these mountains are able to be created is because the bedrock is resistant to erosion. Mudstone is easily eroded, but quartz-rich sandstone is more resistant and thus can better stand erosion. Therefore, the bedrock that makes up the ridges is likely to be composed of quartz-rich sandstone.

wow this is so hard for me im only in elementry school still!