The figure on the left illustrates a pier whose walkway sits 1 meter below the ocean's...
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The figure on the left illustrates a pier whose walkway sits 1 meter below the ocean's surface today. Since we weren't there when it was built 300 years ago, we have to make some assumptions-geologists often do this to make estimates. So let's assume that the pier's walkway was originally 1 m above sea level at high tide, as many are built today (illustrated in the figure on the right), and that submergence occurred at a constant rate. With these assumptions, calculating the rate of submergence for the past 300 years becomes simple arithmetic. (a) The rate of submergence is the total change in the elevation of the pier ( time involved ( m) divided by the total amount of years) and is therefore cm/yr. (Remember, 1m = 100 cm.) Now consider a problem this might solve: (b) A local restaurant owner is considering the purchase of a pier, whose walkway is 50 cm above the high-water mark, for use in outdoor events. The owner has been advised that piers with walkways less than 30 cm above the high-water mark should be avoided because they can be flooded by storms and very high tides. If submergence continues at the rate you calculated, how many years will pass before the high-water mark is less than 30 cm from the base of the deck? yrs. What Do You Think Nowit's time to really try thinking like a geologist. Given your answers to (a) and (b), would you recommend the restaurant owner purchase this pier? In a sentence or two, explain why. Then describe another issue that you think the owner should investigate before they make their decision. 2015 1715 ft 劃 1 m 1 m The figure on the left illustrates a pier whose walkway sits 1 meter below the ocean's surface today. Since we weren't there when it was built 300 years ago, we have to make some assumptions-geologists often do this to make estimates. So let's assume that the pier's walkway was originally 1 m above sea level at high tide, as many are built today (illustrated in the figure on the right), and that submergence occurred at a constant rate. With these assumptions, calculating the rate of submergence for the past 300 years becomes simple arithmetic. (a) The rate of submergence is the total change in the elevation of the pier ( time involved ( m) divided by the total amount of years) and is therefore cm/yr. (Remember, 1m = 100 cm.) Now consider a problem this might solve: (b) A local restaurant owner is considering the purchase of a pier, whose walkway is 50 cm above the high-water mark, for use in outdoor events. The owner has been advised that piers with walkways less than 30 cm above the high-water mark should be avoided because they can be flooded by storms and very high tides. If submergence continues at the rate you calculated, how many years will pass before the high-water mark is less than 30 cm from the base of the deck? yrs. What Do You Think Nowit's time to really try thinking like a geologist. Given your answers to (a) and (b), would you recommend the restaurant owner purchase this pier? In a sentence or two, explain why. Then describe another issue that you think the owner should investigate before they make their decision. 2015 1715 ft 劃 1 m 1 m
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