Answer the question :
how are sand deenes formed ? what are their typical shapes? why are they not permanent in nature.
What are the sources of greenhouse effect Gases? how can their excessive production be checked.
Why are ultraviolet rays harmful for the living being on earth.
Answers
Answer:
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Answer:
Sand dunes are created when wind deposits sand on top of each other until a small mound starts to form. Once that first mound forms, sand piles up on the windward side more and more until the edge of the dune collapses under its own weight.
Explanation:
The crescentic dune, also called the barchand dune, is the most common type of sand dune. As its name suggests, this dune is shaped like a crescent moon with points at each end, and it is usually wider than it is long. Crescentic dunes form when winds blow from one direction.Without vegetation, wind and waves regularly change the form and location of dunes. Dunes are not permanent structures. ... Construction of beachfront homes and hotels can encroach on sand dune habitat. Increased tourism, foot traffic, and removal of plant species can cause severe erosion.
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