Question

how slow do sand dunes travel?

Answer 1

@Nnesha @Willie579 @tkhunny @tootzrll can you guys help?

Answer 2

can anyone help?????

Answer 3

@undeadknight26 @*_*

Answer 4

do you know? toot?

Answer 5

i have no clue. but if i were u, id google it. :/ sorry i couldnt help

Answer 6

ok

Answer 7

i can't find it!!!!

Answer 8

I'll Google it up for research.

Answer 9

I saw this:

"Wind that is blowing 45 miles per hour will move more sand than at 17 miles per hour."

Answer 10

some can swallow half or a whole village

Answer 11

https://en.wikipedia.org/wiki/Dune

Answer 12

idk. :(

Answer 13

oh hey

Answer 14

I was never tagged.

Answer 15

Bye.

Answer 16

sorry

Answer 17

hey poke

Answer 18

@pooja195 TAG YOU'RE IT! :3

Answer 19

There. :P

Answer 20

Fact Sheet #2: How Do Sand Dunes Move?
Sand can only be moved by strong, steady winds. The air must be moving at least 17 miles per hour to be able to pick up sand grains. In the Tularosa basin, it is primarily between February and April that the winds are strong enough. These winds are called unidirectional winds because they always move in the same direction, from the southwest to the northeast. As the wind blows, it pushes the sand ahead of it, so individual dunes are slowly moving to the northeast.
Sand is not as easy to move as you might think. Even very strong winds can't lift the sand any higher than three feet above the ground. As the wind blows, it lifts small sand grains a few inches off the ground, then drops them. When they hit the ground, they bump into other sand grains and cause them to jump up and be caught by the wind. It's almost as if the sand is playing leap-frog, jumping and bumping along. This kind of jumping movement is called saltation. You can see this kind of movement on the windward side of the dune, or the side facing the oncoming wind. But what about the leeward side of the dune, protected from blowing wind? What causes the sand to move on that side?
As the tiny sand grains slowly work their way up the windward dune face, they finally reach the crest, or top of the dune. They fall over the crest and start to pile up because they are protected from the wind. Now gravity steps in to move the dune. As more and more sand grains pile up, the angle of the leeward face becomes steeper and steeper. A pile of loose material, like sand, can only hold a slope of about 34 degrees. When the slope gets greater than 34 degrees, gravity pulls the loose sand down. Small avalanches occur. The sand might run down the

Answer 21

-www.nps.gov/whsa/learn/.../upload/FactSheet2.doc

Answer 22

Thats what i was gonna post T_T

Answer 23

Oh sry. :c

Answer 24

u gotta lot of help now poke :]

Answer 25

Your answer i think lies here
How fast a sand dune moves depends on a number of things. Of course, the speed of the wind is a big factor. Wind that is blowing 45 miles per hour will move more sand than at 17 miles per hour. The size of the dune is also important. Smaller dunes with less sand move much more quickly than large ones. The vegetation also plays an important role. The dunes get caught on the plants that grow in the basin, and that slows them down.

Answer 26

so a sand dune needs Of course, the speed of the wind is a big factor. Wind that is blowing 45 miles per hour will move more sand than at 17 miles per hour. The size of the dune is also important. Smaller dunes with less sand move much more quickly than large ones. The vegetation also plays an important role. and The dunes get caught on the plants that grow in the basin, and that slows them down.

Answer 27

cool thanks guys!!!

Answer 28

No prob! :D

Answer 29

i closed the question you guys can go now bye

Answer 30

bai xDDD

Answer 31

Cya. .3.

Answer 32

cya guys!