<p id="9zxzb"><mark id="9zxzb"></mark></p>

      <p id="9zxzb"><del id="9zxzb"></del></p>

          <pre id="9zxzb"></pre>
          <p id="9zxzb"></p>
          <noframes id="9zxzb"><ruby id="9zxzb"><b id="9zxzb"></b></ruby>

          <pre id="9zxzb"><b id="9zxzb"></b></pre>

          The Mima Mounds in Washington Are a Phenomenon Unexplained by Science

          By: Heather Larson

          There's a strange sight called the Mima Mounds that stretches for hundreds of miles. But nobody knows what caused them. Learn more about this mysterious place in Washington.

          January 13, 2020

          20 miles south of Olympia, Washington, there's a strange sight: The ground is punctuated by hundreds of grass-covered mounds stretching over several hundred acres. These are known as the Mima Mounds, and after decades of research, nobody knows what caused them. Although scientists and explorers believed they'd solved the puzzle of this mysterious land formation at various times, virtually every one turned out to be wrong. You still have a chance to be the hero. Determine how these mimas came to be all in one place and you'll go down in the history books.

          Nature's Impact

          More than two million years ago, massive ice sheets covered the land that is now Washington. According to the Department of Natural Resources (DNR), the soil of the Mima Mounds developed sometime after these ice-age glaciers started to retreat, 16,500 years ago. As the ice melted, it gathered up massive loads of gravel and rock along the way. That accumulation of melted ice and stone spread over Western Washington, creating the unusual black, gravelly soil that eventually formed the mounds. Scientists might understand how the soil was formed, but they're just as puzzled about the origin of the mounds as explorers centuries ago.

          Native American Influence

          Captain Charlies Wilkes, an explorer in the Northwest, stumbled on these round elevations in about 1841. Because of their size — each measured around 6 feet (2 meters) tall and 30 feet (9 meters) wide — he speculated they held deceased members of local tribes. To find out, he dug into a few. He didn't find any trace of humans: just rocks and soil.

          The folktale told by the Upper Chehalis Tribe is more mythical: Thrush, a tribal member, refused to bathe or cleanse her face for fear something bad would happen to the Earth. After much harassment from her people, she gave in and washed her face. It rained so hard the world flooded. When the water receded, the prairie land below took on the shape of waves.

          Excavating Pocket Gophers

          In 1942, Walter Dalquest, a professor at the University of Washington, and Victor Scheffer, a biologist, unequivocally stated in the "Journal of Geology" that pocket gophers created the Mima Mounds. Others have agreed, and some say the mystery has been solved. Scientists are still pursuing the pocket gopher hypothesis, but nobody has conclusively proven that they're the culprits behind the Mima Mounds. Which came first: the gophers or the mounds? Nobody knows for sure.

          Other hypotheses say that they formed via shock waves from earthquakes, ancient floods, or runoff from the glaciers themselves. Some say it may have been the result of the frozen ground cracking into multi-sided shapes at the end of the ice age. That could have allowed ice to wedge into the cracks and leave the soil mounded when it melted.

          Today, you can read about some of these speculations on the observation deck at this National Natural Landmark, which was established in 1966. You can also explore the self-guided interpretive trail, where colorful signs describe the geology, prairie ecology, and Native American use of the area. Depending on the season you visit, you might glimpse blooms of shooting stars, chocolate lilies, western buttercups, lupine, and bluebells, and on a clear day, you'll have a magnificent view of both Mount Rainier and Mount St. Helens — a perfect spot to ponder the mystery of the mounds.

          This article first appeared on Curiosity.com. Click here to read the original article

          Next Up

          Only One Man Has Reached the World’s Deepest Points

          Explorer Victor Vescovo has become the first human to dive to the bottom of the deepest point of all five of the world’s oceans.

          Apollo 12: Return of the Astronaut

          Apollo 12, the second manned mission to land on the Moon was anything but predictable. Here’s a look back at what happened 50 years ago today.

          The First All-Female Spacewalk in NASA’s 61-Year History is Happening

          "A-team" astronauts Christina Koch and Jessica Meir are set to make history in the first all-female spacewalk.

          India's Lunar Leap: The Chandrayaan-2 Mission to the Moon

          India is set to become the fourth nation to land on the moon, behind the United States, Soviet Union, and China. Here's what you need to know...

          UNEXPLAINED AND UNEXPLORED: Investigating the Legend of California's Gold-Laden Ghost Ship

          International mysteries, vintage maps, hidden treasure… Explorers Justin and Emiliano are on the case.

          These Mesmerizing Alaskan Ice Caves Will Very Soon Be Gone

          In Juneau, Alaska, you can take a walk not just on, but in a glacier. That's right — inside the partially hollow Mendenhall Glacier is a surreal landscape of breathtakingly bright blue ice caves, accessible via hike, kayak, and a climb over the ice. You better get there soon, though, because this natural marvel is melting ... fast.

          SpaceX vs. the Universe

          Fans of space are having a tough time picking sides over a recent controversy between SpaceX and astronomers. But what's the big debate all about? Astrophysicist Paul M. Sutter digs into both perspectives.

          Check Out the Crab Nebula –The Leftovers from a Giant Cosmic Firework

          The Crab Nebula sits 6,500 light-years away, and is currently about 11 light-years across. But while it looks pretty from afar, don’t give in to the temptation to visit it up close.

          Welcome to the Surface of Mars

          Through the use of cutting-edge instruments, scientists finally have the opportunity to probe deep beneath the surface and ascertain exactly how the terrestrial planet formed.

          Let’s Look for Water on the Moon

          NASA is headed to the moon, but this time it's in search of water. Astrophysicist Paul M Sutter shares what this means and why it's important.
          免费视频www777788coom