Question

how are deltas formed?
○ erosion of softer rock
○ connection of channels
○ deposition from flow into a lake or an ocean
○ creation of large, flat areas by flooding deposits

Explanation:

To determine how deltas are formed, we analyze each option:

• "Erosion of softer rock" is related to landforms like valleys or canyons, not deltas.
• "Connection of channels" does not describe delta formation.
• Deltas are formed when a river carrying sediment flows into a lake or ocean. The sediment (sand, silt, clay) is deposited as the river's velocity decreases, creating a delta. So "deposition from flow into a lake or an ocean" is correct.
• "Creation of large, flat areas by flooding deposits" describes floodplains, not deltas.

Answer:

C. deposition from flow into a lake or an ocean