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An Indonesian woman watches an eruption from the Mount Sinabung volcano from Tiga Pancur village, in Karo in North Sumatra on November 3, 2017. Sinabung roared back to life in 2010 for the first time in 400 years. After another period of inactivity it erupted once more in 2013, and has remained highly active since. (Photo by Ivan Damanik/AFP Photo)

An Indonesian woman watches an eruption from the Mount Sinabung volcano from Tiga Pancur village, in Karo in North Sumatra on November 3, 2017. Sinabung roared back to life in 2010 for the first time in 400 years. After another period of inactivity it erupted once more in 2013, and has remained highly active since. (Photo by Ivan Damanik/AFP Photo)
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13 Nov 2017 07:31:00
An aircraft crosses a bridge over a highway the airport in Frankfurt, Germany, Friday, September 20, 2019. Protests of the “Friday For Futurte” movement against the increase of carbon dioxide emissions are planned Friday in cities around the globe. In the United States more than 800 events were planned Friday, while in Germany more than 400 rallies are expected. (Photo by Michael Probst/AP Photo)

An aircraft crosses a bridge over a highway the airport in Frankfurt, Germany, Friday, September 20, 2019. Protests of the “Friday For Futurte” movement against the increase of carbon dioxide emissions are planned Friday in cities around the globe. In the United States more than 800 events were planned Friday, while in Germany more than 400 rallies are expected. (Photo by Michael Probst/AP Photo)
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14 Feb 2020 00:03:00
Turkish World Record Holder in freediving Sahika Ercumen dives to raise awareness about pollution in sea waters in Kas district of Antalya, Turkiye on June 07, 2023. Every year 400 tons of one time use plastic are made globally and in Turkiye 91 percent of the plastics are not recycled. (Photo by Sebnem Coskun/Anadolu Agency via Getty Images)

Turkish World Record Holder in freediving Sahika Ercumen dives to raise awareness about pollution in sea waters in Kas district of Antalya, Turkiye on June 07, 2023. Every year 400 tons of one time use plastic are made globally and in Turkiye 91 percent of the plastics are not recycled. (Photo by Sebnem Coskun/Anadolu Agency via Getty Images)
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21 Jun 2023 02:15:00
Mount Roraima

Mount Roraima (Spanish: Monte Roraima, also known as Tepuy Roraima and Cerro Roraima; Portuguese: Monte Roraima [ˈmõtʃi ʁoˈɾajmɐ]) is the highest of the Pakaraima chain of tepui plateau in South America. First described by the English explorer Sir Walter Raleigh in 1596, its 31 km2 summit area is defended by 400-metre-tall cliffs on all sides. The mountain includes the triple border point of Venezuela, Brazil and Guyana.
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11 Sep 2012 08:04:00
Saeva Dupka Cave

Saeva dupka (Bulgarian: Съева дупка) is a cave in Northern Bulgaria near the village of Brestnitsa, Lovech Province (43°2′N 24°11′E). Its five halls and 400 metres of corridors offer some of the most beautiful cave formations in the country. Besides that the cave has hosted many Choral music performances, thanks to the excellent acoustic conditions. Saeva dupka was named after two brothers Seyu and Sae who used it as a hiding place during the Ottoman occupation of Bulgaria. Recent excavations have showed the cave was inhabited since Roman times. Currently Saeva dupka is one of the 100 Tourist Sites of Bulgaria.
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20 Feb 2013 11:30:00
View of colourful rock formations at the Zhangye Danxia Landform Geological Park in Gansu Province, China. The Zhangye Danxia Landform Geological Park is 40km from Zhangye city. The park spans more than 400 square kilometers in Gansu. The unusual terrain is the result of red sandstone and mineral deposits carved over the years by natural forces. A number of boardwalks have been built to encourage visitors to explore the rock formations. (Photo by ImagineChina/The Grosby Group)

View of colourful rock formations at the Zhangye Danxia Landform Geological Park in Gansu Province, China. The Zhangye Danxia Landform Geological Park is 40km from Zhangye city. The park spans more than 400 square kilometers in Gansu. The unusual terrain is the result of red sandstone and mineral deposits carved over the years by natural forces. (Photo by ImagineChina/The Grosby Group)
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02 Dec 2013 09:12:00
Villagers look on as Mount Sinabung volcano spews thick volcanic ash, as seen from Beganding village in Karo, North Sumatra province, on May 19, 2017. Sinabung roared back to life in 2010 for the first time in 400 years. After another period of inactivity, it erupted once more in 2013 and has remained highly active since. (Photo by Ivan Damanik/AFP Photo)

Villagers look on as Mount Sinabung volcano spews thick volcanic ash, as seen from Beganding village in Karo, North Sumatra province, on May 19, 2017. Sinabung roared back to life in 2010 for the first time in 400 years. After another period of inactivity, it erupted once more in 2013 and has remained highly active since. (Photo by Ivan Damanik/AFP Photo)
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20 May 2017 10:09:00
 Tiger Stone – A Fast and Tidy Drafting Brick Road Machine

Tiger-stone allows you to build 400 yards of road a day using cobblestone. This doesn’t automatically sort, cut and arrange the bricks in patterns. It just lays them. Someone needs to put the right bricks in the right places at the top.
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26 Nov 2012 14:48:00