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What can geologist learn about past conditions by examining dunes bars and ripples?
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∙ 7y ago
Geologists can learn about past conditions such as wind direction, sediment composition, and rates of erosion and deposition by examining dune bars and ripples. These features provide valuable information about ancient environments and the processes that were active in shaping the landscape.
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Most common wind deposit?
ripples
What type of transport mechanism forms ripples and dunes composed of sand grains?
traction, saltation and suspension
What does the presence of dunes indicate about conditions on a planet or moon?
Dunes on the surface of a planet indicates it has loose sand being blown by wind.
What landform is most likely to be produced by windblown sand?
In general, a land form formed by windblown sand is likely to be a sand dune, although depending on the direction and strength of the wind, it may also be formed into sets of wave like ripples. Dunes are much larger and more permanent than ripples, which are usually only one meter in wavelength, and no more than one meter in amplitude. ripples disappear and appear in wind storms, but dunes, which are immense, stay solid, and slowly migrate downwind, unless they are fixed in place with vegetation.
What is paleocurrent directions?
Paleocurrent direction is important in reconstructing past climate and drainage patterns: sand dunes preserve the prevalent wind directions, and current ripples show the direction rivers were moving.
Deposited in ancient sand dunes what term describes the complex original stratification pattern seen in sandstones?
Trough Crossbeds are the stereotypical deposit made from fossilized sand dunes. There are however many finer scaled deposits made on the dune such as wave ripples which are only a few sand grains in height.
What feature of sedimentary rocks forms inclined grains as layers move forward?
Cross-bedding refers to inclined layers in sedimentary rock that were formed as a result of wind or water driven ripples or dunes in the original depositional environment.
What were the conditions of the terrain in El Alamein in World War 2?
It was open hard desert with sand dunes to the south.
What kind of dunes are there?
Seif dunes and star dunes in Algeria
What are huge piles of sand called?
Large piles of sand are called dunes.
What erosional agent causes deflation blowouts desert pavement and dunes?
Wind erosion causes all the conditions mentioned in your question.
How many sand dunes are in Michigan?
There are only two sand dunes in Michigan. The two sand dunes are Sleeping Bear Dunes and Sliver lake sand dunes.
