The Permian–Triassic extinction event, colloquially known as the Great Dying, the End-Permian Extinction or the Great Permian Extinction, occurred about 252 Ma ago, forming the boundary between the Permian and Triassic geologic periods, as well as the Paleozoic and Mesozoic eras.
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Russia, the world?s largest nation, borders European and Asian countries as well as the Pacific and Arctic oceans. Its landscape ranges from tundra and forests to subtropical beaches. It?s famous for Moscow's Bolshoi and St. Petersburg's Mariinsky ballet companies. St. Petersburg, founded by Russian leader Peter the Great, has the baroque Winter Palace, now housing part of the State Hermitage Museum?s art collection.

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