How far does the 100-year lahar extend from the summit?
What will be an ideal response?
68.5 km to the Port of Tacoma
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The Doppler effect is a characteristic of
A. sound waves. B. water waves. C. light waves. D. all of the above
Marine animals rely on coastal wetlands, mangrove swamps and rivers for spawning grounds,
A) but in recent years these animals have found other spawning grounds. B) but human intervention has provided artificial spawning grounds. C) but these only constitute a small percentage of marine animals. D) but these are being destroyed by pollution and over development.
Which of the following is of particular importance in studying the effect of radiation on the body?
A) energy B) intensity C) both a and b D) neither a nor b
Suppose that engineers are unable to keep earth materials from coming down onto a highway. In this case, which of the following would be the most economical and effective technique for reducing the hazard?
A. remove the mountain B. build a protective structure C. close the highway during heavy rains D. install a rain sensor E. reroute the highway