The triangular-shaped body of water that forms where a streams enters a larger body of water is a/an A. alluvial. B. delta. C. meander. D. rejuvenation.

The question is asking for the name of "the triangular-shaped body of water that forms where a streams enters a larger body of water" and the choices are: A. alluvial. B. delta. C. meander. D. rejuvenation. The correct answer is B. delta. A Delta is a letter of the Greek alphabet that looks like a triangle, and when people saw the shape of the water, it remined them of the letter and they called it a "delta". One of the best recognized Delta is the Delta of the Nile in Egypt, which provides a lot of fertile soil to plant on