If 25 km3 of sand is deposited on a beach yearly and 28 km3 of sand is removed by wave action, the size of the beach would be decreasing, not increase.
First, there is a need to understand that the size of a beach is a function of the amount of sand deposited into it. The more the sand deposited, the more the beach would increase in size.
In this case, 25 km3 of sand is deposited annually but 28 km3 of sand is washed away by waves. The net amount of sand deposited can be calculated by subtracting the amount washed away by waves from the amount deposited. Thus
Net sand deposited = 25 - 28
= -3 km3
Hence, the net amount of sand deposited annually is negative, meaning that the beach would decrease in size.
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