Singing sand dunes surprised the scientific world

Sand in Altyn-Emel National Park (Kazakhstan) emits strange, melodious sounds. Scientists have yet to find the exact cause of this unique phenomenon.

This singing sand hill is 150m high and 3km long.

When the weather was dry, the sand began to speak.Singing is not continuous.Each lesson only lasts a few minutes.

The sound is quite similar to cello or bassoon.

The best way to hear the sand is to climb to the top of the hill and slide down.At that time, sand broke out and a strange sound began to sound.

Scientists believe that this noise is from the flow of sand created when moving.

In fact, the sound emitted by sand grains rubbed against each other.

A wave rolls over the hill, moves sand grains along the way and creates a mysterious sound.

Singing sand dunes are just one of many interesting attractions in Altyn-Emel, a national park 4 times larger than Hong Kong.

The 155km Sharyn Gorge is dubbed the "brother of the Grand Canyon".

More than 260 species of animals live here, from buzzard to beaver.

Here, paleontologists discovered many animal fossils, from rhinos to ancient turtles, many of which are millions of years old.However, the most mysterious thing in Altyn-Emel is the sand hill that sings.