Each Summer, a Large "Dead Zone" Devoid of Fish and Other

question 32

Multiple Choice

Each summer, a large "dead zone" devoid of fish and other animals develops where the Mississippi River flows into the Gulf of Mexico. What causes this?

• A) There are high levels of mercury in the river water.
• B) Global warming is making the river water too hot for the fish to tolerate.
• C) Acid rain makes the gulf's water too acidic to support fish.
• D) High levels of pesticides are used in the Mississippi River basin.
• E) Large quantities of fertilizer run off from Midwestern farm fields into the Mississippi River.

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Gas Lines

refer to queues of vehicles waiting to fill up fuel at gas stations, often observed during periods of fuel shortages.

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A curve depicting the maximum attainable combinations of two products that can be produced with available resources and technology.

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