At the heart of the mystery of sleeping volcanoes!

Previously in episode 3. Therefore, In the heart of the mystery of the Rose du Mont Saint-Michel :

Thanks to the pink recovered at Mont Saint-Michel, Zoé and Eliott have theenergyenergy Cosmic: the link between earth and other elements of space such as LuneLune or the SoleilSoleil. However, But the machine screen starts to flash in red. Moreover, BIP-BOP emits a bizarre sizzle. Nevertheless,

– Energy failure … For example, Volcanic source required … Therefore, Press … Moreover, button … However, Orange.

On these words, the purple indicator goes out. Moreover, For the next step, Zoé and Eliott will have to manage without a bip-bop. Similarly,

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– How are we going to be Zoé? For example, Eliott asks, which has become pale. For example,

– I don’t know heart mystery sleeping volcanoes! yet, she replied, scratching her head.

– Pressing the orange button on the machine, suggests Eliott. Furthermore, These are the last words of bip-bop so it may be going to put us on the track of. Furthermore, a volcanic source …

By following the advice of her little brother, Zoé presss the button and crosses her fingers. Similarly, She thinks very hard: As long as it helps us … Then the two children disappear. Similarly,

A few moments later, they land at the top of a sort of steep mountain. However, The wind blows hard on their cheeks. However, All around them, imposing summits stand, covered with a shaved grass and golden by the sun. Nevertheless, Below, Zoé and her brother see a bewitching blue lake, surrounded by fir treesfir trees bulky. Therefore,

– We are on the Puy Montchal apparently, said Eliott, pointing to a heart mystery sleeping volcanoes! sign.

-A Puy … Similarly, like Puy-de-Dôme, one of the Auvergne volcanoes? Consequently,

– I hope. However,

While children wander on the Puy’s summary without really knowing where to go, a flash of genius crosses Eliott’s eyes.

– Professor Chronos told us to keep the notebook, because he was going to serve us? Similarly, he recalls. However, What if it was now? In addition,

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Quickly, he begins to leaf through the pages of the notebook. Moreover, Gard bridgenon. For example, Palace of Versaillesnon. However, Brocéliandenon. Therefore, Puy Montchalthat’s it! However, A kind of panoramic card is drawn on yellowed paper, accompanied by small comments. However,

– Look, it’s exactly the same forms in front of us! Similarly, he exclaims. Consequently, Here is the chain of Puys. Therefore, There, it is the Sancy massif, the highest volcano of the Massif Central. Therefore, And there it is the Cantal massif, the largest stratovolcanstratovolcan from Europe. Additionally, Therefore, We are very close to volcanoes, we will be able to help Bip-Bop! Moreover,

– Did you say a stratovolcana? Furthermore, What is that? Nevertheless,

– Ah that, I know! Meanwhile, I read it in a book last week, smiles Eliott. For example, In fact, a stratovolcana is really the classic idea that we have of a volcano. Therefore, It was formed by a stack of lava, explosive products, ash, mud … Furthermore, Over time, all these layers can form a steep volcano, if the eruptions are always at the top. Similarly, But the eruptions are not always at the same top, so they can create lots of different shapes.

– Different forms? Furthermore, Asks Zoé, looking around. Consequently,

– Yes. Similarly, look on the notebook, there are small drawings of certain forms, said Eliott by tending him the notebook he keeps heart mystery sleeping volcanoes! carefully. Moreover,

– Oh. However, then looking at these drawings, I think the Puy de Dôme is a volcanic domevolcanic domeis that it? For example, Zoé analysis.

– Exactly ! Furthermore,

– There is another large type of volcanoes: shield volcanoes! Furthermore, They are formed by fluid lava flows which extend and reach long distances. Meanwhile, Shield volcanoes are therefore very flattened and very long. And there are also volcanoes in the water!

– Ah, I understand better! Finally, the volcanoes are super varied, notes Zoé. Come we walk a little to the lake, I’m really hot here!

– I follow you and I will take advantage of it to pick up stones on the way!

– Eh ? Ask Zoé. Do you pick stones?

– Yes, you will understand, replied Eliott with a wink ofeyeeye.

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Along the path, Eliott stops many heart mystery sleeping volcanoes! times and analysis of stones. Sometimes it rests it on the way. Other times, he stuffs it in his bag to of theof the Before joining Zoé.

Zoé, she cannot come back: very long ago, there were rashes. She would not have been so serene while walking here.

-You know. she begins, I knew the Puy de Dôme, but I would never have thought there were so many volcanoes in Auvergne.

– On the notebook. it is written that there are 80 volcanic buildings which form the volcano of the chain of Puys, adds Eliott. It’s huge!

– Wow, and you think they could wake up one day?

– Uh … Technically … Yes … it’s possible, empty -handed Eliott by lowering her voice. The last eruption took place 7,000 years ago in the Puys chain. So this volcano is not really off, it is rather heart mystery sleeping volcanoes! considered asleep. Not so long ago, scientists noted the presence of magmamagma under volcanoes. But the chances that it explodes now are very very low …

– So all the volcanoes in France are asleep? asks Zoé to reassure himself.

– No, not all, shivers Eliott. In Guadeloupe, there is the Soufrière … She smokes and sometimes, she rumbles. There have been evacuations in the past! In Martinique, there is the Pelée mountain, his last great eruption was in 1932. And in Reunion … there is the Fournaise PitonFournaise Piton. He can erupted several times a year!

Eliott observes all around him and gets closer to Zoé to reassure himself.

– Can we stop talking about it please? It scares me a little …

– A little ? laughs Zoé. Many you mean, you tremblestrembles Like a sheet. Have you finished with the stones soon?

– Oui !

Children go towards the shadow of a TREETREE : it is hot. it is out of the question to catch a sunburnsunburn. Then, Eliott hands two stones to his sister.

– Here, compare their weight, said Eliott.

Zoé takes the stones in her hands. She weighs them by folding her eyes.

– Oh, there is one heavier than the other! she exclaims.

– Yes, the volcanic rockvolcanic rock May indicate the type of eruption!

– How so ? Ask Zoé.

– In general, the heaviest rock comes from a effusive eruptioneffusive eruption : It is when the lava flows along the volcano. In fact. the lava of a effusive volcano loses a large heart mystery sleeping volcanoes! part of its gazgaz Going up to the surface and flowing. An effusive eruption therefore rather forms smooth and dense rocks. The lightest rock comes from a explosive eruptionexplosive eruption : this is when the lava is projected in the airsairs. In this case, the lava is more viscous which prevents the gas from escaping. There pressionpression Increases and gas is free to explode in an explosion. In this case, the rocks are rough and full of air bubbles.

– So that one comes from an an excustion volcano? Questions Zoé by showing the smooth rock.

– Yes, and this one comes from an explosive volcano, continues Eliott, designating the rough rock.

Then, Zoé plunges into a long silence. She thinks. After a few minutes, she asks: heart mystery sleeping volcanoes!

– Do you think we should take them to the lake? Perhaps they represent a particular energy for the mission that Professor Chronos entrusted us.

“You’re right,” approves Eliott.

Zoé stuffs the two rocks in her bag, right next to Bip-Bop. Then, the two children start walking along a small path that winds between the trees. They follow the panels that indicate the path to a particular lake … Lake Pavin.

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After a long walk, the children arrive by the lake. The water is deep blue. The fir trees surrounding it are bright green. Sometimes the silence is broken by the chantchant Birds or the wind that blows on the branches.

– I think it’s a butbutas on the notebook. They are quite difficult to distinguish but this lake is one. specifies Eliott, proud to present to his sister heart mystery sleeping volcanoes! everything he has read.

– What if we were going to bathe?, Offers Zoé.

– Are you sure? request Eliott, the eyebrowseyebrows surveys. There is no one in the water, it is not very reassuring …

– Don’t worry, it should just be because the water is a little cold.

So Zoé puts her bag on a rough rock. She thinks: From what Eliott told me, the eruption had to be explosive here.

But, before Zoé and Eliott had time to put a single toe in the water, something begins to vibrate. At first, the vibrationsvibrations are not really noticeable. But gradually, they grow and resonate in the Maar.

Surprised, Zoé and Eliott turn around: the vibrations come from the bag. BIP-BOP.

Then a voice rises:

– Attention ! Do not go in this water!

– BIP-BOP! You have energy again! exclaims Zoé. heart mystery sleeping volcanoes!

– Yes, you have deposited volcanic rocks next to me, explains the Bip-Bop voice. I see that you did well for this step.

– Very well even, specifies Eliott. We used the notebook found in the cave of the BaumeBaume Good.

-But, tell me Bip-Bop, why can’t we swim in the lake? Ask Zoé. It’s hot yet …

– This lake is the deepest of Auvergne with 92 meters deep. The water is very very cold, even close to the surface.

Eliott shivers and think: Fortunately we didn’t have time to jump into the water …

– This is where the last eruption took place in mainland France, almost 7000 years ago. And Lake Pavin is unique in France: it is a meromictic lake.

– Meromictic? What is that? Eliott request

– That means that the lake water is only mixed up to 60 meters deep. heart mystery sleeping volcanoes! Between 60 and 92 meters, the waters are motionless and loaded in gas like the carbon dioxidecarbon dioxidel’nitrogennitrogen or methane.

– And is it dangerous? Slowly pronounces Eliott, eyes wide open.

– If there is too much gas. that an event disturbs this area, it can cause what is called a limelic eruption, explains Bip-Bop. This means that the gas chosen can be released on the surface and create a cloudcloud gas. This one remains plated on the ground and can kill the wildlifewildlifelivestock and humans. It has already happened at Lake Nyos in Cameroon for example. But don’t panic, you’re not going to die! Scientists monitor the lake very closely to be able to prevent in the event of suspicious activity.

– It’s a shame, I heart mystery sleeping volcanoes! wanted to swim, sighs Zoé.

– Don’t worry, for our next step, you can swim, reassures bip-tip.

Eliott takes the machine, points the volcanic rocks and press on the blue button. Again, a lightlight Left rocks and flies to the antenna. The little tinkle sounds and the inscription is displayed: 2 / 7.

– Perfect, this is volcanic energy, explains Bip-Bop. It is important since at one point, there was a volcanismvolcanism very important on earth. He participated in the creation of thegreenhousegreenhouse of our atmosphereatmosphere. Thanks to the released gas, the land was able to warm up enough to allow life.

Zoé and Eliott look around them, amazed. Without all the volcanoes on the earth, there might have had no life.

– Now. you have heart mystery sleeping volcanoes! to rest the volcanic stones where you have found them so as not to disturb nature, said Bip-Bop.

– And what is our next step? Ask Zoé, impatient to discover a new place.

– To find out, you will have to solve an enigma, Bip-Bop announcement. Here it is:

« I build castles always uninhabited.

I am a home for the biodiversitybiodiversity,

Most often I am described as golden

Who am I? »

In your opinion … What is the answer to the enigma?

Response to the next episode!

Thanks to Ludovic LeducLudovic Leduc, volcanologuevolcanologue et scientific mediatorscientific mediatorfor his help.