Vous avez déjà entendu parler du brouillard de glace ? À Budapest, en 2015, un épais brouillard est soudainement apparu, mais ce n'était pas un brouillard ordinaire - il était glacé. La température a chuté et tout ce qu'il a touché s'est transformé en glace, même les arbres et les animaux malchanceux. C'est comme un signe d'avertissement de Dame Nature elle-même, rappelant aux voyageurs de faire attention car on ne sait jamais quelle folie elle a en réserve. Oh, et en parlant de surprises de la nature, avez-vous déjà entendu parler des lumières de séisme et d'inexplicables vibrations du sol ? C'est comme si la Terre disait : "Hé, je secoue un peu les choses !" Juste au moment où vous pensiez avoir tout compris de la nature, elle vous surprend avec ces phénomènes incroyables ! 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
----------------------------------------------------------------------------------------
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
Category
😹
FunTranscript
00:00 In December 2014, an entire district of Budapest was covered in ice crystals.
00:06 The trees in the area could not bear such pressure and began to bend under their weight.
00:11 It was a frightening phenomenon called the ice fog.
00:15 When it happens, the temperature drops considerably, freezing everything around,
00:19 a bit like the Detrackers in the Harry Potter saga.
00:22 And all this thanks to a cross temperature chasing.
00:25 It not only affects urban furniture, but also creates ghostly pillars and halos shining in the dark.
00:31 The ice fog is made up of tiny ice crystals.
00:35 When the temperature drops below -10°C, the droplets of water in the air freeze and turn into crystals.
00:42 Until then, they remain in a liquid state, unless they find something to freeze on.
00:47 The ice fog is generally formed in the coldest regions of the world, such as the Arctic or the Antarctic.
00:53 Budapest was the least expected.
00:56 Hot and humid gases emitted by vehicles and planes can also create a foggy fog.
01:01 A plane takes off on a cold day, and bam!
01:04 It releases so much fog that the next plane can't see anything.
01:08 This happens sometimes.
01:10 It's not the same as ice powder, however.
01:12 Which is when spare crystals fall from a clear sky.
01:16 They form when there is a lot of humidity, almost 100%,
01:19 and when the air temperature drops below 0°C.
01:23 This creates suspended ice crystals in the air, which end up on different surfaces.
01:28 Note that the first pioneers of the North thought that these crystals could penetrate their lungs and cause them a lot of problems.
01:35 There are many other ice formations just as fascinating, such as the fig tree.
01:40 It occurs when the air is cold, but the ground has not yet completely frozen.
01:44 The sap inside the plant stems expands when it freezes, which makes them burst.
01:48 Once this happens, the liquid flows, meets the frozen air, and turns into thin layers of ice,
01:54 creating beautiful formations in the form of petals or ribbons.
01:58 The lights of earthquakes are another strange and unique phenomenon.
02:04 When a powerful earthquake of magnitude 8.1 hit Mexico in 2017,
02:10 strange images of green and blue light in the sky began to spread on the Internet.
02:16 These famous Mexican seismic lights only added to the mystery.
02:21 Like the lightning bolt, the lightning of earthquakes is quite rare,
02:25 and just as prodigious as difficult to apprehend for scientists.
02:29 What complicates things is that the observations of lights around earthquakes do not all seem to agree.
02:35 There are many myths and theories about this phenomenon.
02:39 Lights can be declined in many shades and colors, and in many forms.
02:44 Studying our past, historians have isolated 65 stories mentioning such apparitions,
02:50 some of which date back to the 17th century.
02:53 On November 12, 1988, for example,
02:57 people reported that a bright purple sphere was floating along the St. Lawrence River in Quebec,
03:02 only 11 days before a powerful earthquake.
03:05 In Pisco, Peru, the phenomenon took the form of bright lights that were captured by security cameras in 2007,
03:12 before an earthquake of magnitude 8.
03:15 And in 2009, before another earthquake in Italy, in L'Aquila,
03:19 people observed flames of a dozen centimeters dancing above paved streets.
03:24 However, debates persist about the reality of these seismic lights.
03:28 The Institute for Geological Studies of the United States is cautious,
03:32 because it is unknown whether these individual testimonies around the time and place of an earthquake
03:37 really raised the phenomenon in question.
03:41 During a study, scientists hypothesized that these lights could be caused by electric charges
03:49 released by specific types of rocks during seismic activity,
03:53 a bit like when you turn on a battery in an earthquake.
03:56 Some rocks, such as basalt and gabbro, have tiny crystalline defects.
04:01 They could potentially release these electric charges.
04:04 Researchers estimated that the conditions necessary for the appearance of such lights
04:08 were only found in less than 0.5% of earthquakes in the world.
04:12 This could explain their rarity.
04:15 They also noted that the lights tended to appear more often before or during earthquakes than after.
04:21 A previous study suggested that tectonic pressure could cause an electric piezo effect,
04:27 where rocks containing quartz generate powerful electric fields when they are compressed.
04:32 However, the study of seismic lights remains difficult because they are unpredictable and short-lived.
04:38 It is time to talk about these mysterious halos that suddenly appear around the Moon or the Sun.
04:46 You are walking with a friend and suddenly you notice it.
04:49 It is a warning from Mother Nature.
04:51 A snowstorm or rain is preparing.
04:55 These halos form when billions of tiny ice crystals in the clouds refract the light of the Sun.
05:01 Resist the temptation to admire this marvel with the naked eye.
05:05 It can damage your eyes.
05:07 Take sunglasses and observe it for about forty minutes at most.
05:11 Nature sends us many other early warnings.
05:15 If the sea mysteriously withdraws, revealing corals and fish, a tsunami could be approaching.
05:21 Also be careful of the current of tornadoes on the beach.
05:24 And sharks could venture further than usual if a storm escapes.
05:28 You feel your hair stand up and your jewels vibrate.
05:31 It is lightning that could fall nearby.
05:34 Quickly seek shelter.
05:36 Avalanches, green storms and lakes near volcanoes all present potential dangers.
05:41 The cross-sea is just as dangerous.
05:43 And practicing speleology during a full Moon could cost you your life.
05:47 If the ocean turns red, avoid swimming there.
05:50 There could be toxic algae in the water.
05:52 Animals also detect disasters.
05:54 If they behave strangely, be careful.
05:58 A fascinating blue light is manifested around the Matsu Islands during summer nights.
06:05 It is caused by tiny luminous creatures, the dinoflagellates.
06:09 Tourists love to watch this spectacle.
06:12 But there is a drawback.
06:13 It is toxic and increases in size every year, as revealed by a study.
06:17 Despite its enchanting appearance, the phenomenon is harmful.
06:20 A team of oceanographers used satellite data to track its progress over 19 years.
06:25 After analyzing nearly a thousand images, they concluded that it spread to deeper waters.
06:31 Unfortunately, this expansion poses a threat to marine life.
06:34 Matsu's blue tears can poison fish and sea turtles and even affect human health.
06:40 Although dinoflagellates are not harmful in themselves,
06:43 their toxic algae-composed diet releases toxic chemical compounds in the water.
06:47 This process also drains oxygen, endangering marine fauna.
06:51 The main cause is uncertain.
06:53 But the pollution from the agriculture practiced along the Yangtze River seems to play a crucial role.
06:59 Agricultural rustle introduces nutrients that feed this flora.
07:04 During the construction of the Three Gorges Dam,
07:06 the extent of the phenomenon decreased when the river flow reduced.
07:09 Then, after the completion of the dam and the return of a powerful current, it regained more beauty.
07:14 Researchers predict that these "blue tears" will continue to spread,
07:19 posing a constant threat to marine life and producing more and more luminous waters.
07:24 A catabatic wind occurs when cold and dense air descends along a mountain slope due to gravity.
07:33 These winds can be powerful, sometimes reaching the speed of a hurricane.
07:37 But this is rare.
07:39 Unlike other descending winds, catabatic winds such as the Adriatic storm or the Santa Ana wind in California
07:45 come from air that cools in high reliefs such as plateaus or mountains.
07:50 As the air descends, it warms up and its temperature depends on its source region.
07:56 In Antarctica, catabatic winds play a crucial role in the formation of wind fields.
08:02 And in this region, as in Greenland, they can be particularly intense and reach the strength of a hurricane.
08:09 They contribute to unique phenomena such as the dry valleys of McMurdo in Antarctica
08:14 and are associated with the feared Willy Woz who swept the archipelago of the Land of Fire and Alaska.
08:20 The fire of St. Helm is a natural phenomenon that deserves to be mentioned.
08:27 It occurs during storms or volcanic eruptions.
08:30 When a powerful electric field reigns over the area,
08:33 it produces a purple or blue glow around the masts of ships, aircraft stops or pointed objects.
08:39 This glow is caused by ionized air molecules and is most visible in low-light conditions.
08:45 It is a form of plasma that manifests when the electric field around an object causes the ionization of air molecules.
08:53 This can occur during storms because there are strong differences in tension between clouds and the ground.
08:59 Glowing objects facilitate the appearance of the fire of St. Helm because the electric field is more concentrated.
09:05 The colors you see, whether blue or purple, come from the fluorescence of nitrogen and oxygen in the Earth's atmosphere.
09:13 It is similar to how our neon lamps work, but with different gases.
09:18 And from Ancient Greece to China in the 15th century, this phenomenon has been observed throughout history.
09:24 (dramatic music)