What natural feature, when it flows into a larger body of water, often forms the Greek letter Delta in shape?

• A. River
• B. Mountain
• C. Sea
• D. Lake

Answer: (A)

When a river reaches a larger body of water, its flow slows and loses the energy needed to carry sediment. That sediment settles at the mouth and builds up as deposits. Over time, these deposits spread out into the standing water, creating a fan‑shaped, outward ribbon that resembles the Greek letter delta (Δ). This pattern forms most reliably where a steady supply of sediment is carried by the river and the receiving waters are relatively calm, allowing buildup rather than being swept away by strong waves or currents. The other options don’t transport and deposit sediment in this way at a mouth, so they don’t produce the delta shape.