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Orda Cave is located in the Perm region of Russia. The temperature has dropped below -32 °F (-36 °C). But it couldn't stop a photoshoot, starring a two-times world champion in free diving Natalia Avseenko. The temperature of the water was 41 °F (5 °C). Perm Krai (Russian: Пе́рмский край, tr...

A crater lake is a lake that forms in a volcanic crater or caldera, such as a maar; less commonly and with lower association to the term a lake may form in an impact crater caused by a meteorite, or in an artificial explosion caused by humans. Sometimes lakes which form inside calderas are called caldera lakes, but often this distinction is not made...

Chicago (/ʃɪˈkɑːɡoʊ/ or /ʃɪˈkɔːɡoʊ/) is the most populous city in the U.S. state of Illinois, and the third most populous city in the United States, with approximately 2.7 million residents. Its metropolitan area (also called "Chicagoland"), which extends into Indiana and Wisconsin, is the third-largest in the United States, after those of New York City and Los Angeles, with an estimated 9.8 million people...

The Amazon rainforest (Portuguese: Floresta Amazônica or Amazônia; Spanish: Selva Amazónica, Amazonía or usually Amazonia; French: Forêt amazonienne; Dutch: Amazoneregenwoud), also known in English as Amazonia or the Amazon Jungle, is a moist broadleaf forest that covers most of the Amazon Basin of South America. This basin encompasses seven million square kilometers (1.7 billion acres), of which five and a half million square kilometers (1.4 billion acres) are covered by the rainforest...