The Populated Fraser River Delta South of Vancouver,B

question 11

Multiple Choice

The populated Fraser River delta south of Vancouver,B.C.,is subsiding primarily because

• A) dams upstream catch the sediments that otherwise would reach the delta.
• B) groundwater pumped for agriculture is causing the ground surface to sink.
• C) dykes built to protect human infrastructure keep new sediments off the delta.
• D) slow slippage along the Cascadia subduction zone causes the delta to warp downward.
• E) sea level rise is eroding the delta faster than replenishment occurs.

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