With its 8.848 meters above the sea level, Mount Everest is the tallest mountain on the earth, but if we consider measuring mountains from the bottom of the ocean, the highest mountain is the Mauna Kea, a dormant volcano located in the Hawaiian Big Island, with 10.210 meters (more than a km taller than Everest!).
Owing to the dry atmosphere, elevation and stable climate, Mauna Kea is one of the best sites in the world for astronomical observation. On its summit, there are observatories useful for scientific research, despite not well considered by Native Hawaiians, for whom the summits of the Hawaiian mountains are sacred places.
The Irta’Ale(or Erta Ale) volcano, located in the northern area of Ethiopia, Danakil depression, is one of the few existing volcanoes with permanent lava lakes (since the beginning of the 20th century).
613 meters high, it is one of the most spectacular formations of Northern Africa (like the nearby Danakil depression).
From Addis Abeba and Makelle there are organized tours for tourists: the ascent is about 3 hours, rather easy, but pay attention to the hot temperature.
Everyone knows Yellowstone, located in the northwest area of Wyoming, for bison, geysers, Yogi Bear and the beautiful natural formations, but one of the most fascinating aspects of this place is hidden under the ground: the Yellowstone caldera (volcanic crater formed after the collapse of an empty magma chamber) is one of the few supervolcanoes on the earth, formed after the Lava Creek eruption, approximately 630,000 years ago, and now located in one of the so-called earth’s crust hot spots, where the magma goes through the earth’s mantle and approaches the surface. The caldera measures approximately 50 kilometers long and 75 kilometers wide.
It is supposed that the destructive potential of the Yellowstone caldera is thousands – maybe millions – of times higher than the atomic bombs dropped on Hiroshima and Nagasaki during World War II.
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