Name: なぜ砂丘に不思議な穴が現れるのか？ (Why Are Mysterious Holes Appearing In Sand Dunes?)
Uploaded: 2021-01-14T05:38:19.000Z
Duration: 3 min 43 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

A sand dune in Indiana has started swallowing people walking on its face. It's like nature

Hello there people of House Atreides, Trace here reporting on a horrrrrible thing for

DNews. Science is now exploring how and why sand dunes will eat you. No I'm not talking

about the lighting sand or pit of Sarlacc, Arrakis or any of that. I'm talking about

REAL SAND ON REAL DUNES HERE ON EARTH THAT CAN SWALLOW YOU WHOLE.

The Indiana Dunes National Lakeshore is gorgeous, I've been there a few times and it's beautiful,

but it seems, it has the potential to be deadly. Picture this, six-year-old boy walking down

a sand dune next to a beautiful freshwater inland sea. Then suddenly, without warning,

he disappears. His parents run screaming toward the boy and find nothing but sand. A hole

had appeared below this kids feet and before he OR his nearby parents could do anything

Three hours later, and eleven feet down, emergency personnel pulled him out! ELEVEN FEET. Nearby,

was a geologist from Indiana University Northwest and she is now one of many studying the dunes

to find the cause of this sand swallowing. She believes we're seeing a new geological

More holes have appeared and disappeared and to find out what's going on, the National

Park Service is ON THE CASE. They're using GPS, ground penetrating radar and other fancy

technology to explore what's going on under the surface of this 200 foot pile of sand.

But so far they're not sure what's happening. Because dunes SHOULDN'T HAVE HOLES!

See, sand dunes form when the wind drops the stuff it's carrying in the same spot for thousands

of years. When the wind blows over a sandy region, like the warm beaches of Lake Michigan,

sand particles are pulled along with it -- bouncing a few inches above the surface. If something

blocks the flow of sand, like denser air, mountains, opposing wind forces, or even a

small ridge; then WHAMMY, a dune will form. When conditions are perfect, giant dunes like

When you build a dune like this, one particle of sand at a time, there's not a lot of room

for air or water to get trapped inside the sandy mountain. Sinkholes // which are terrifying

// form when erosion removes the support structure under a layer of earth. Quicksand is the same,

it's water erosion of the layers UNDER the sand. So, unlike quicksand or sinkholes there's

nothing under there making room for people to be sucked in. One hypothesis claims trees

and structures once on a plain around the dune have now been swallowed by this shifting

mountain and as they rot they leave spaces for more sand to fall in. But that doesn't

fully explain the problem. Science is bumfuzzled!

So what's the fix? The National Park Service isn't sure. Like deserts and marshes, dunes

are a delicate balance of nature. Too much plant life solidifies the ground creating

a hill, too little and the dune blows away. Baldy is in a sweet spot where the whole dune

can grow and shift; and it's currently moving inland away from the lake, year after year.

Dunes in China are going the same way, threatening villages as they move 65 feet (20M) every

year. For the moment, the dune is close to the public while they research what could

be causing these collapses, but this is a REAL science mystery!

What do you think could be causing these holes?

You should tell us your own cocka-mamy theories down in the comments, I'm sure you've got

an idea. Subscribe for more awesome DNews videos every day of the week and if you want

to say "hi!" come to twitter and search for me at-tracedominguez or at-dnews! Thanks for

watching today! We have the best viewers on this crazy-ass website. See you next time,