Sometimes a River Will Flow Through a Structural and Topographic

question 61

Multiple Choice

Sometimes a river will flow through a structural and topographic high,such as a dome.In order for this to occur,what had to happen?

• A)people must have created a channel through the feature by blasting,drilling,or tunneling.
• B)the river once flowed underground in a cave,but the roof of the cave collapsed and created a surface channel.
• C)the river was flowing through the area prior to uplift and the river was able to erode down through the feature as uplift occurred.
• D)rivers began flowing from the top of the feature-but on opposite sides.Through time,the rivers eventually joined together as a result of headward erosion,and thereby cut through the structure.
• E)a dam was constructed allowing more water to remain in the channel and the river was able to flow over the topography.