The Columbia River Estuary Received Its Most Significant Ecological Damage

question 28

Multiple Choice

The Columbia River estuary received its most significant ecological damage from which of the following sources?

• A)dikes erected by farmers to prevent flooding
• B)dredging of the river to accommodate boat traffic
• C)hydroelectric dams
• D)pollution due to soil erosion from logging
• E)poor farming practices

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Definitions:

Early Stage

Referring to the initial period or phase of a process, development, or condition.

Mammogram

A radiographic examination of the breasts to detect abnormalities such as tumors, often used in breast cancer screening.

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A form of cancer that develops in the prostate gland of men, often characterized by difficulty in urination, pelvic pain, and, in later stages, bone pain.