# social studies

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a barrier island is 1 km wide and 10 km long. If erosion by a longshore current causes the island to lose 1.5 m of its with per year, how long will it take for the island to lose one-fourth of its width?

• social studies -

1 km = 1000 m

0.25 * 1000m = 250m = 1/4 of its width

250 / 1.5 = ? years

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