Géologie
What are the geologic times?
A Brief History of Geologic Time
En observant les couches sous nos pieds, les géologistes ont été capables d'identifier et de décrire des épisodes cruciaux de l'histoire de la vie. Ces évènements clés façonnent les chapitres de l'histoire de la vie sur Terre et le système utilisé pour relier ces chapitres ensembles est l’Échelle des Temps Géologiques.
When did the Earth warm the last time?
The Last Time the Globe Warmed
Imagine an enormous, lush rainforest teeming with life...in the Arctic. Well there was a time -- and not too long ago -- when the world warmed more than any human has ever seen. (So far)
How did supercontinents appear and disappear?
The Whole Saga of the Supercontinents
The study of natural history is the study of how the world has changed but Earth itself is in a constant state of flux -- because the ground beneath your feet is always moving. So if we want to know how we got here, we have to understand how "here" got here.
When it rained for two million years
That Time It Rained for Two Million Years
At the beginning of the Triassic Period, with the continents locked together from pole-to-pole in the supercontinent of Pangea, the world is hot, flat, and very, very dry. But then 234 million years ago, the climate suddenly changed for the wetter.
How the Yellowstone created a reserve of fossils?
How a Supervolcano Made the Cenozoic’s Coolest Fossils
One of the most dynamic, transformative, and potentially dangerous features in North America is also responsible for some of the continent’s most amazing fossil deposits. It’s a supervolcano we now call Yellowstone.
How 7,000 years of regular floods changed the world?
How 7,000 Years of Epic Floods Changed the World (w/ SciShow!)
Strange geologic landmarks in the Pacific Northwest are the lingering remains of a mystery that took nearly half a century to solve. These features turned out to be a result one of the most powerful and bizarre episodes in geologic history: this region experienced dozens of major, devastating floods over the course of more than 7,000 years.
The history of climate change
The History of Climate Cycles (and the Woolly Rhino) Explained
Throughout the Pleistocene Epoch, the range of the woolly rhino grew and shrank in sync with global climate. So what caused the climate -- and the range of the woolly rhino -- to cycle back and forth between such extremes?
How did volcanic activity freeze the Earth?
How Volcanoes Froze the Earth (Twice)
Over 600 million years ago, sheets of ice coated our planet on both land and sea. How did this happen? And most importantly for us, why did the planet eventually thaw again? The evidence for Snowball Earth is written on every continent today.
When Antartica was green
When Antarctica Was Green
Before the start of the Eocene Epoch about 56 million years ago--Antarctica was still joined to both Australia and South America. And it turns out that a lot of what we recognize about the southern hemisphere can be traced back to that time when Antarctica was green.
Why did the Mediterraen Sea disappear?
That Time the Mediterranean Sea Disappeared
How could a body of water as big as the Mediterranean just...disappear? It would take decades and more than 1,000 research studies to even start to figure out the cause -- or causes -- of one of the greatest vanishing acts in Earth’s history.
When the Sahara was green
When the Sahara Was Green
The climate of the Sahara was completely different thousands of years ago. And we’re not talking about just a few years of extra rain. We’re talking about a climate that was so wet for so long that animals and humans alike made themselves at home in the middle of the Sahara.
What is the Great Unconformity?
When a Billion Years Disappeared
In some places, the rocks below the Great Unconformity are about 1.2 billion years older than those above it. This missing chapter in Earth’s history might be linked to a fracturing supercontinent, out-of-control glaciers, and maybe the diversification of life itself.
How did the Andes mountain kill marine animals?
How the Andes Mountains Might Have Killed a Bunch of Whales
At a site known as Cerro Ballena or Whale Hill, there are more than 40 skeletons of marine mammals -- a graveyard of ocean life dating back 6.5 million to 9 million years ago, in the Late Miocene Epoch. But the identity of the killer that they finally settled on might surprise you.
How did plate tectonics start?
The World Before Plate Tectonics
There was a time in Earth’s history that was so stable, geologists once called it the Boring Billion. But the fact is, this period was anything but boring. In fact, it set the stage for our modern version of plate tectonics - and probably for the rise of life as we know it.
Qu'est ce que l'Anthropocène, cette nouvelle ère géologique dominée par l'impact de l'homme sur la nature ?
L'Anthropocène MaP#33
Je vous parle de l’Anthropocène. Une proposition d’époque géologique pour souligner le fait que l’homme est maintenant une force dominante dans l’évolution de notre planète. Mais, qu’est-ce qu’une époque géologique ? On a tant d’impact que ça sur notre planète ? Quand faire commencer cette époque géologique ? Qui a le dernier mot sur cette histoire ? Tant de questions passionnantes auxquelles j’essaie de répondre dans cette vidéo.
http://www.facebook.com/le.reveilleur
https://en.tipeee.com/le-reveilleur
Voyage au centre de la Terre — Science étonnante #47
Qu'y a-t-il vraiment sous nos pieds ? Un océan de magma en fusion ?
https://www.facebook.com/sciencetonnante
https://en.tipeee.com/science-etonnante
The Sea Monster from the Andes
In 1977, a farmer was plowing his field on a plateau high in the Andes mountains when he stumbled upon a giant fossilized skeleton. How did this giant marine reptile end up high in the Andes Mountains?
