Multiple Choice
Why might soils rich in organic matter not always be fertile?
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1. Introduction to Biology
Introduction to Biology
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Which process leads to the formation of an oxbow lake?
A
A tectonic fault causes land to sink, forming a lake in the depression.
B
A meandering river erodes its banks, eventually cutting off a loop and leaving a separate, crescent-shaped lake.
C
A volcanic eruption creates a crater that fills with rainwater.
D
A glacier melts, leaving behind a depression that fills with water.
Verified step by step guidance1
Understand the concept of an oxbow lake: An oxbow lake is formed when a meandering river erodes its banks over time, creating a loop that eventually gets cut off from the main river channel.
Recognize the role of erosion and deposition: The river's flow erodes the outer banks of the meander while depositing sediment on the inner banks, gradually changing the shape of the river.
Identify the cutoff process: As the meander becomes more pronounced, the river may create a shortcut by eroding through the narrow neck of the loop, leaving the loop isolated from the main river.
Describe the final formation: The isolated loop becomes a crescent-shaped oxbow lake, separated from the river and filled with water.
Compare with other processes: Note that the formation of an oxbow lake is distinct from processes like tectonic activity, volcanic eruptions, or glacial melting, which create lakes through different mechanisms.
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