Sand castles do not last long on an ocean beach. The water levels change with the tide. When the tide is low, the waves don't come all the way up the beach. When the tide 'comes in', at high tide, the water comes farther up the beach. As a result, sand castles get destroyed by the strong waves.​
A.to instruct
B.to describe or explain
C.to persuade
D.to inform
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