La nature est pleine de surprises, et certaines d'entre elles sont vraiment étranges ! L'une des plus fascinantes est le fleuve Qiantang en Chine, où l'on peut voir le plus grand mascaret du monde - d'énormes vagues qui remontent le fleuve comme un mur d'eau. Ensuite, il y a le phénomène des "arc-en-ciel de feu", qui ressemblent à des flammes arc-en-ciel dans le ciel mais sont en réalité causés par la lumière du soleil frappant des cristaux de glace dans les nuages. Avez-vous déjà entendu parler des chutes de sang ? C'est lorsque de l'eau de couleur rouge s'écoule d'un glacier en Antarctique ! Il y a aussi des plages bioluminescentes, où l'eau brille la nuit grâce à de minuscules organismes lumineux. La nature sait vraiment comment créer des spectacles à couper le souffle ! Animation créée par Sympa. ---------------------------------------------------------------------------------------- Musique par Epidemic Sound https://www.epidemicsound.com Pour ne rien perdre de Sympa, abonnez-vous!: https://goo.gl/6E4Xna ---------------------------------------------------------------------------------------- Nos réseaux sociaux : Facebook: https://www.facebook.com/sympasympacom/ Instagram: https://www.instagram.com/sympa.officiel/ Stock de fichiers (photos, vidéos et autres): https://www.depositphotos.com https://www.shutterstock.com https://www.eastnews.ru ---------------------------------------------------------------------------------------- Si tu en veux encore plus, fais un tour ici: http://sympa-sympa.com
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00:00The surface of this river gives the impression of being covered with fish scales.
00:04Could it be a huge aquatic dragon or some other mythical creature?
00:08Not really. The explanation is more ground to ground, although surprising in its own way.
00:13Let's go back to the very beginning.
00:15This is the Qiantang River, located in China, and the Hangzhou Bay, which constitutes its estuary,
00:21that is to say the part where the course of the river meets the sea.
00:25This region is famous for housing the largest masquerades in the world.
00:29Waves of powerful tides rising up the river against the current.
00:33In the Qiantang, these masquerades can reach up to 9 meters in height, which is impressive.
00:39The region is regularly witness to the passage of these long waves rising up the river.
00:44However, in 2021, during a scientific expedition,
00:48experts observed an extraordinary natural phenomenon, unique to this area.
00:53Sometimes, the waves come as a whirlwind, creating what is called the famous fish scale tide.
01:00What distinguishes this region are its rotating currents,
01:04which make the tide not content to progress towards the land before turning back.
01:08Indeed, a rotating current can easily change direction without altering its speed.
01:13This makes the Qiantang River a place conducive to the appearance of waves hitting oblique angles
01:19and thus giving birth to a phenomenon similar to a cross sea.
01:23Let us now address this phenomenon.
01:25These wavy patterns on all sides of the ocean captivate the eye,
01:29as if the underwater deities had surrendered to a part of a giant chessboard.
01:33This is a cross sea, also called square sea or square wave.
01:38Unlike the waves that usually reach the shore in a parallel way to the coast,
01:43these draw a pattern in a grid on the surface of the water in certain regions of the globe.
01:48Seen from above, they can give the impression that an underwater grid creates these square waves.
01:53However, square waves do not result from a phenomenon taking place under the surface.
01:58They are generated by the dynamics of water movements.
02:01In certain regions, the weather conditions cause the formation of waves at different angles.
02:07When two opposing waves meet, this unique pattern then appears on the surface.
02:14As fascinating and unusual as this natural phenomenon may seem,
02:18it also presents a real danger.
02:21If you see square waves swimming, get out of the water immediately.
02:25Indeed, these waves are often associated with rip currents,
02:29powerful currents that go offshore from the coast.
02:33In addition, square waves can reach up to 3 meters in height,
02:37a test that even the most experienced swimmers would not be able to face.
02:42Let's leave the oceans aside for the moment,
02:44in order to go to the largest active volcano in Europe, Etna.
02:48The latter continues to amaze us with its impressive spectacles of smoke rings.
02:52But wait, people live nearby.
02:55Shouldn't they be evacuated?
02:57The volcano seems about to erupt.
02:59Calm, there is no need to panic.
03:01Specialists reassure us,
03:03the formation of such rings does not foretell an imminent eruption.
03:07These white smoke circles are made up of water vapors
03:10and are formed as a result of gas bubbles erupting in a narrow duct
03:14located above a magmatic chamber.
03:17Etna has even been nicknamed the Ring Lady.
03:20And currently, the volcano is surpassing its own records.
03:23For example, in 2000, it generated about 5,000 of these smoke rings.
03:28According to researchers, no other volcano on Earth
03:31produces as many whirling rings as Etna.
03:34The southeast crater is particularly active,
03:37constantly emitting magnificent smoke circles.
03:40Do not leave the sky,
03:42you could see a spectacle similar to the one
03:44that the inhabitants of New Jersey recently observed.
03:47A gigantic fireball burned the sky of this small state
03:50and the neighboring regions.
03:52This brilliant ray of light had been left by a free-falling meteorite.
03:56Residents of several towns in New Jersey,
03:59as well as some counties in New York,
04:02Pennsylvania and Connecticut,
04:04reported this phenomenon to the American Meteor Society.
04:07Security recordings published online by some witnesses
04:11show the lightning striking the sky in a few seconds
04:14at 3.43 am.
04:17Another extraordinary phenomenon recently captured
04:20is one of the rarest in the world
04:22and almost impossible to observe with the naked eye.
04:25An Australian photographer,
04:27on the outskirts of Derby during the humid season,
04:30managed to capture a few lightning bolts.
04:33He later stated that they had disappeared in a blink of an eye
04:37and described them as large,
04:39purple and red-colored,
04:41sprinkled with bright spots.
04:44The lightning bolts are massive electric shocks
04:47manifesting themselves in various forms
04:49and taking the appearance of orange-red flashes.
04:52They only last a fraction of a second
04:54and occur after lightning of extreme intensity.
04:57Although these phenomena are usually caused by electric shocks
05:01between a storm cloud and the ground,
05:03lightning bolts rise up to an altitude of 100 km.
05:07Remarkable fact,
05:08this phenomenon was long considered fictitious
05:11before scientists finally managed to capture it on film.
05:15Since then, lightning bolts are regularly recorded.
05:18The Catatumbo lightning bolt
05:20is the longest lightning storm in the world.
05:23The heart of this recurring storm
05:25is located above the mouth of the Catatumbo river,
05:27where it spills into Lake Maracaibo, Venezuela.
05:30This storm rises at an altitude higher than that of ordinary storms.
05:35It occurs from 140 to 168 per year,
05:38spreads over 9 hours a day
05:40and generates 16 to 40 lightning bolts per minute.
05:44It is often said that lightning never strikes twice in the same place.
05:48However, Catatumbo seems to ignore this maxim,
05:50or at least,
05:51it does not prevent storm clouds from returning to the same place every year.
05:55A hiker in the United Kingdom managed to capture spectacular clichés
05:59of a meteorological phenomenon
06:01nicknamed the Brocken spectra.
06:03Admired rather,
06:05this scene was immortalized
06:07using a Canon 5D Mark IV camera.
06:10The silhouette seen is however not an immaterial being,
06:13but simply the shadow of the photographer,
06:16in the center of a circular rainbow.
06:18Fascinated,
06:19he took a few more pictures
06:21before continuing on his way.
06:23Such an effect occurs when a person is located
06:26above the upper surface of a cloud,
06:28on a mountain,
06:29or another relief,
06:31while the sun shines on his back.
06:33When the shadow of the observer appears,
06:35the light reflects in a way
06:37to create a strange circular glow
06:40around the point located directly opposite the sun.
06:43Another striking celestial phenomenon
06:45was observed in Auckland.
06:47What does it make you think of?
06:49One might think it is a spaceship
06:51from another civilization.
06:53But in reality,
06:54it is a rare meteorological phenomenon.
06:57Those who have seen this circular formation
06:59have described a hole in the cloud cover,
07:02and some have even noticed
07:04the presence of a small rainbow inside.
07:06This phenomenon is known under the names of
07:09Kavoom,
07:10or Virgo hole.
07:11Such a formation is quite unusual,
07:13even specialists have only observed it
07:15a few times during their careers.
07:18This phenomenon results from an atmospheric disturbance
07:21in the surface of the water,
07:23often caused by a plane or another similar element.
07:26As a result,
07:27this cold water at the extreme
07:29quickly turns into ice crystals,
07:31which, being heavier than the surrounding cloud,
07:34fall leaving a void.
07:36This process,
07:37which is carried out at high altitude,
07:39takes only a few minutes.
07:41Let's go back to Earth
07:42to observe a rare phenomenon in the United States.
07:44An event of such magnitude
07:45had not occurred since 1803.
07:47Billions of cicadas,
07:49belonging to two distinct generations,
07:51simultaneously emerge from the subsurface,
07:54after more than two centuries of waiting.
07:56These singing and noisy insects
07:58belong to two distinct families of periodic cicadas.
08:01One emerges on the surface every 13 years,
08:03while the other appears every 17 years.
08:06It is rare that the cycles of these two groups coincide.
08:09But this year,
08:10such an exceptional event occurs.
08:12The two groups,
08:13with distinct cycles,
08:14simultaneously emerge.
08:16They are known as
08:17CuV-13 and CuV-19.
08:20And they have been observed,
08:21as well as heard,
08:22throughout the south of the United States,
08:24as well as to the north of Illinois.