Question

A thin peninsula called a spit extends beyond the bluffs of the outer beach on cape cod. what has caused this spit to form?

Answer 1

Sand from the bluffs is carried and deposited by longshore currents.

Answer 2

A spit is a finger-like ride of sediment that extends into deeper water due to longshore currents.  The drift occurs due to waves meeting the beach at an oblique angle, moving sediment down the beach in a zigzag pattern. This is complemented by longshore currents, which further transport sediment through the water alongside the beach. Hope this answers the question.