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China's Great Green Wall: The giant artificial forest designed to slow the expansion of 2 desertsSince 1978, China has planted more than 66 billion trees along its 2,800-mile-long northern border, and it wants to plant 34 billion more over the next 25 years to complete its "Great Green Wall."
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Sistema Ox Bel Ha: A vast hidden system that's the longest underwater cave in the worldThis incredible submerged cave network is the longest of its kind in the world and plays a vital role in the region.
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Triple Divide Peak: Montana's unique liquid 'crossroads' where water can flow into three oceansTriple Divide Peak in Montana is the only place on Earth where water can flow into one of three different oceans, according to some definitions.
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Eternal Flame Falls: New York's mini waterfall that hides a grotto filled with undying fireEternal Flame Falls sits on a bed of shale rocks rich in organic matter. As this matter breaks down, it produces highly flammable natural gas that escapes through cracks in the ground.
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Coral Triangle: The giant hidden 'Amazon' beneath the sea that appears somewhat resilient to climate changeThe Coral Triangle is an extremely biodiverse patch of ocean around the Philippines and Papua New Guinea. Its relatively murky waters appear to shield it against climate change — for now.
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Cairo Fossil Forest: The oldest forest in North America with 385 million-year-old treesThe Cairo Fossil Forest is the second oldest in the world. These forests mark a turning point in Earth's history because they changed the composition of the atmosphere, scientists say.
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Narusawa Ice Cave: The lava tube brimming with 10-foot-high ice pillars at the base of Mount FujiThe Narusawa Ice Cave is a natural lava tunnel that formed during a violent eruption of Mount Fuji in A.D. 864. Every winter, the cave grows giant ice pillars due to its freezing temperatures.
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Loughareema: The 'vanishing lake' in Northern Ireland that mysteriously drains and refills itself within hoursThe Vanishing Lake in Northern Ireland's County Antrim can be full in the morning and empty a few hours later, thanks to an underground drainage system that scientists still don't fully grasp.
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Three Whale Rock: Thailand's 75-million-year-old stone leviathans that look like they're floating in a sea of treesThree Whale Rock is a geological formation and tourist attraction in Thailand's Phu Sing Forest Park that looks remarkably like a small family of whales.
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