ELI5: Explain Like I'm 5

Batagaika crater

The Batagaika Crater is like a giant hole in the ground, but it's not like the holes you might dig in the sandbox. This hole is over half a mile long and up to 300 feet deep! It's found in a part of Siberia called the Sakha Republic, which is in Russia.

The way the Batagaika Crater formed is actually really interesting. You know how when water freezes it expands and turns into ice? Well, imagine that happening to the ground! That's what happened in the area where the Batagaika Crater is now. A long time ago, the ground started to freeze, and then more and more ice formed under the surface. As the ice kept growing, it pushed up the land above it. And then, eventually, something happened that made the ice start to melt. When the ice melted and turned back into water, it left behind empty spaces where it used to be. With nothing to support it, the land above the empty spaces started to sink down into the ground. And that's how the Batagaika Crater formed!

Now, the Batagaika Crater is actually really important for science. When the land sank down, it exposed layers of soil and sediment that had been hidden for thousands of years. Scientists can study these layers to learn about what the area was like a long time ago. They can learn about things like the climate, the types of plants and animals that lived there, and even what the Earth's magnetic field was like back then! So while the Batagaika Crater may look like just a big hole in the ground, it's actually a very important window into the past.