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What forms an esker?

An esker is formed by the deposition of sediments carried by meltwater from a retreating glacier. As the glacier melts, the sediment is deposited in a sinuous ridge-like formation. Eskers are typically composed of sand and gravel.


Could you find a valley on the moon?

Yes, there are valleys on the moon called rilles or sinuous rilles. They are long, winding valleys that were likely formed by ancient lava flows or collapsed lava tubes. One of the most famous lunar valleys is Vallis Schröteri, located near the Aristarchus Plateau.


Is the Mississippi River braided or a meandering river?

The Mississippi River is primarily a meandering river, characterized by its sinuous, looping flow. However, it can display some braided characteristics in certain sections where the river channel splits into multiple smaller channels that rejoin downstream.


How are underwater caves formed?

underwater caves are formed when over a period of time, tides smashes the rocks and erodes it. gradually, it forms an underwater cave. +++ It's true that sea-caves, as the answer states, are formed by erosion by wave-action, and they can hold deep water, but I suspect the questioner is asking about true underwater caves. If so: Undersea cavessuch as the Blue Holes are normal terrestrial karst caves formed in low-lying limestone at a time of depressed sea-levels (the glaciations), then drowned as sea-level rose when the ice-cover retreated. Water-filledcaves on land areagain simply normal limestone caves, but the passages have formed vertically-sinuous profiles that trap water in "sumps",rather like the U-bend under the kitchen sink.


Why do gentle sloping wide rivers have more meanders than steep fast-flowing rivers?

Gentle sloping wide rivers have more meanders than steep fast-flowing rivers because the slower flow velocity allows sediment to be deposited along the riverbanks, leading to the formation of point bars and cut banks, which in turn create meanders. In contrast, steep fast-flowing rivers have higher erosive power, which prevents the formation of stable meanders as the river cuts straight through the landscape more efficiently. Additionally, the higher energy in steep rivers results in less deposition and more erosion, leading to a more straight channel morphology.