Teacher:In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Teacher: Now, understand the problem? Solve this instance: Millions of visitors a year come to Arizona's Grand Canyon National Park, one of the seven natural wonders of the world and the most visited national park in the western United States. However, on extremely rare days when cold air is trapped in the canyon and topped by a layer of warm air, which in combination with moisture and condensation, form the phenomenon referred to as the full cloud inversion. In what resembles something between ocean waves and fast clouds, Grand Canyon is completely obscured by fog, making the visitors feel as if they are walking on clouds. 
  
 This video was filmed as part of SKYGLOW (skyglowproject.com), an ongoing crowdfunded quest to explore the effects and dangers of urban light pollution in contrast with some of the most incredible dark sky areas in North America. This project is being produced in collaboration with International Dark-Sky Association (darksky.org), a non-profit fighting for the preservation of night skies around the globe. 
  
 The film was shot on Canon 5DSR & 5DIII cameras & lenses sponsored by Canon USA, aided by Alpine Labs' Michron & Pulse, powered by Paul C. Buff Vagabond Mini. LRTimelapse was used to process some of the shots. Adobe Lightroom and Premiere used for editing and processing. 
  
 Original video premiered on BBC Earth: bbc.com/earth/story/20170502-on-rare-occasions-the-grand-canyon-fills-with-thick-cloud 
  
 Follow up to this video, KAIBAB REQUIEM can be seen here: vimeo.com/246551452 
  
 KAIBAB ELEGY Photo Stills: http://bit.ly/2CkGARQ 
  
 SKYGLOW Book Stills: http://bit.ly/2vXO7Ag 
  
 Other Photos from SKYGLOWPROJECT.COM: http://bit.ly/2whWSaQ 
  
 Credits: 
  
 Producer/Editor/Shooter: Harun Mehmedinovic, Music: Pete Davis & James Banbury 
  
 Special Thanks: 
  
 Gavin Heffernan and Aida Bogunic, Semezdin & Sanja Mehmedinovic, Matt Walker & Pierangelo Pirak, Aaron McNally & Canon USA, Kevin Noble & Paul C. Buff Inc., Greg Horvath & Alpine Labs, International Dark-Sky Association, Northern Arizona University, State of Arizona & National Park Service 
  
 Locations: 
  
 Grand Canyon National Park, Arizona 
  
 Follow/Contact: 
  
 Facebook facebook.com/skyglowproject 
  
 Instagram: instagram.com/skyglowproject 
  
 Email: info@skyglowproject.com 
  
 We appreciate all your shares, comments and likes, thanks for checking out this video! For more videos please visit: vimeo.com/harun 
  
 This video is COPYRIGHT 2017 Harun Mehmedinovic / SKYGLOWPROJECT.COM. Any use beyond embedding this video in it's unaltered form and properly credited to SKYGLOW PROJECT/SKYGLOWPROJECT.COM on another website requires permission from the creator. Any use of the entirety or portion(s) of this video to drive advertising traffic, sales or any other profit-driven venture on a third party website without express permission from the content creator will result in prosecution to the full extent of the law. 
  
 ------- 
  
 Timelapse artists and filmmakers Gavin Heffernan and Harun Mehmedinović are proud to introduce WWW.SKYGLOWPROJECT.COM, a 192-page hardcover photobook and timelapse video series exploring North America’s remaining magnificent night skies and the increasing impact of light pollution on our highly fragile environment. 
  
 A blend of images, stories, essays, and anecdotal captions, SKYGLOW explores the history and mythology of celestial observation and the proliferation of electrical outdoor lighting that spurred the rise of the phenomena known as “light pollution,” a grave threat not only to our incredible starscapes but also to the very ecosystem itself. 
  
 After a highly publicized Kickstarter campaign that ended as the fourth-most earning Photobook campaign ever, Harun and Gavin traveled over 150,000 miles and logged more than 3,000,000 photos on their grueling three-year quest. From incredible locations like the active Kīlauea volcano in Hawaii to Alberta’s majestic Northern Lights, SKYGLOW takes viewers on a visual journey through time, exploring our civilization’s evolving relationship with light and the night sky through the ages. 
  
 See how the ancient Puebloan archaeoastronomy sites of our native elders have now been replaced with the blinding “artificial day” of over-lit modern metropolises, and learn about the “Dark Sky Movement” fighting to reclaim the pristine darkness the Earth had enjoyed for billions of years. The importance of America’s threatened National Parks is also highlighted in a section of stunning landscapes from numerous parks, including Shenandoah, Yosemite, Acadia, Death Valley, Yellowstone and many more. 
  
 Completed in collaboration with the International Dark Sky Association (IDA), SKYGLOW also explores the numerous towns and sites that IDA has identified as official “Dark-Sky” Communities, Cities, Parks, Reserves and Sanctuaries. ||||| Join over six million BBC Earth fans by liking us on Facebook, or follow us on Twitter and Instagram. 
  
 If you liked this story, sign up for the weekly bbc.com features newsletter called "If You Only Read 6 Things This Week". A handpicked selection of stories from BBC Capital, Culture, Earth Future and Travel, delivered to your inbox every Friday. |||||
Student:
A spectacular new video is giving the internet a view of the Grand Canyon like it's never seen it before: filled to the brim with clouds. The Arizona Republic reports the phenomenon is known as cloud inversion. It happens when a layer of warm air traps cold air close the ground, creating fog. "It’s kind of like another planet, practically, the way it looks," says Harun Mehmedinovic, who shot the video. Mehmedinovic visited the Grand Canyon 30 times in order to capture a full cloud inversion. He says he spent the day trying to convince disappointed tourists that seeing the Grand Canyon full of clouds was even better than the traditional view. Mehmedinovic's video was first shared by BBC Earth on May 3.