What are two causes of the subsidence of New Orleans?
A) Draining of organic-rich soil and earthquakes
B) Draining of organic-rich soil and loss of supply of fine sediments by rivers
C) Draining of organic-rich soil and the dissolution of clays by flowing acidic groundwater
D) Dissolution of clays by flowing acidic groundwater and earthquakes

Question

Quizplus · Accepted Answer

The draining of organic-rich soil and loss of supply of fine sediments by rivers are the two primary causes of subsidence in New Orleans. When the land is drained, the organic material in the soil breaks down and the ground sinks. Additionally, the levees and dams constructed along the Mississippi River have trapped sediment upstream, preventing it from being deposited into the delta and causing the land to sink.

What Are Two Causes of the Subsidence of New Orleans