Mammoth Cave in Kentucky is the world’s longest cave.
Iceland is expanding at around 2 cm per year due to its moving tectonic plates.
Trees weren’t always biodegradable.
Sandy Island, a land mass about the size of Manhattan, has been on world maps for over 100 years. In 2012, scientists set out to explore the land mass but couldn’t find it. An Australian later published an obituary for the island.
The Thulean Route, also known as the North American Land Bridge (NALB), was a volcanic Thulean plateau that arose around 56 million years ago. It stretched from Greenland to the British Isles, connecting North America with Eurasia.
Earth is the only known planet with plate tectonics.
Some parts of Antarctica have had no rain or snow for the last 2 million years.
Mount Everest shrank one inch (2.5 cm) due to the 2015 earthquake in Nepal.
While Mount Everest’s peak is the highest altitude in the world, Hawaii’s Mauna Kea is actually the tallest mountain from top to bottom by 1 km over Mount Everest.
Lave flows from Indonesia’s Kawah Ijen volcano has been photographed showing blue flames.