Which mechanism primarily causes lagoon formation behind a developing barrier island?

💡 Explanation

Longshore drift transports sediments that accrete, forming a barrier island. A lagoon forms because sediment deposition causes the ocean to be cut off, creating a shallow, brackish body of water; therefore, longshore drift enables deposition rather than faulting or volcanism.

• Accelerated thermokarst formation results when which mechanism prevails?
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