Tunnel erosion is classified as a type of which erosion process?

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Erosion caused by raindrop impactErosion involving thin layers of water flowErosion forming small channels on the soil surfaceErosion resulting in large, deep channels or gulliesNone of the above

Explanation

Tunnel erosion is a subtype of gully erosion, characterized by the formation of underground channels or tunnels beneath the soil surface, which eventually contribute to the development of gullies.