Dunes

by: Sydney & Jamie

What A Dune Looks Like?

A dune looks like a mound, hill, or ridge of sand that is caused mostly by wind. A dune has a windward side and a slip face side. A dunes windward side is the side that wind pushes the grains of sand upward. And the slip face side is the side that simply has no wind at all. The slip face side is most of the time is the smoothest side of the dune giving a more wavy look to the dune. A dune can also be by the beach making it look kind of like snow if it is a white sand beach.

What is the environment like?

The environment is mostly very dry and very windy. You could say its hot if you are in the desert which most of the time you are. There is one other place that the environment might be a little different. The underwater dune is not created by air but by the water and it's current. The environment for these dunes are very different. It is mainly tropical and obviously very wet.

How has erosion impacted it? And how was it created?

Erosion is the process by which materials of Earth's surface are broken down and carried away by natural agents, such as wind and water. A dune is created by wind or water currents. And those things will move one grain of sand at a time to create a huge dune field or dune belt.


ALL THE DIFFERENT DUNES!


  • You may think that a dune is a large geographic feature but sometimes they are just small lumps of sand.You can mostly tell if it's a dune by the shape of it. But you may not know there are about five or six different dunes. And they are the Crescentic, Linear, Dome, and Parabolic.
  • The Crescentic dune is a dune that is shaped like a crescent, or a wide letter C. The wide side of a crescentic dune is it's windward side, with a small, semi-circle slip face on the other side. This dune moves the most and the fastest and also is the most common dune you will ever see.
  • Linear dunes form a strait lines or close to strait lines. Some people say that unstraight linear dunes look like a wiggling snake, with regular curves. Linear dunes form when the wind presser is nearly the same on both sides of the dune.
  • Star dunes have pointed ridges and a slip face on at least three different sides. Star dunes develop in places where the winds come from menu different directions. The sand dunes from the Sahara Desert are mainly Star dunes.
  • Dome dunes are the rarest dunes type of dune. They are circular and do not have a slip face side. The wind can blow grains of sand sand onto the dune at any side.
  • Parabolic dunes are similar to the crescentic dune. Their shape is almost the same, but their slip face slide is on the inward part of the dune. Parabolic dunes are also called blow outs, because the wind blows out the center of the dune, leaving just a rim on the out side.
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Crescentic Dune

This is a crescentic dune and you can see the large C looking shape.