Alaska is the most northern state in the USA, covering 2 million square kilometres. Alaska is one of the most sparsely populated places on Earth. Nearly half its , residents live in the city of Anchorage. Since the s approximately , Inuit have been joined by permanent settlers. A wealth of ecosystems span the vast and varied landscapes of Alaska from temperate rainforests to tundra. Alaska has been home to people for thousands of years despite it being one of the coldest regions on Earth.
Indonesia’s Merapi volcano spews ash, debris in new eruption
Indonesia’s Merapi volcano spews ash, debris in new eruption | World News,The Indian Express
Understanding gases dissolved in magma is critical in understanding why volcanoes erupt. Bodies of magma rise in the crust until they reach a point of neutral buoyancy. The expansion of gases brings the magma closer to the surface and drives eruptions. The interaction between the viscosity and temperature of the magma and the gas content determines if an eruption will be effusive or explosive. On a global scale, volcanic gases produced our atmosphere and our oceans. Without the atmosphere and oceans, life would not have evolved on Earth. Gases emitted by volcanoes continue to influence the atmosphere but not to the extent of man-made sources.
AstraZeneca phase 3 trials show 79% efficacy in symptomatic cases, 100% against severe disease
Teide's elevation above sea level makes Tenerife the tenth highest island in the world. Teide is an active volcano : its most recent eruption occurred in from the El Chinyero vent on the northwestern Santiago rift. The United Nations Committee for Disaster Mitigation designated Teide a Decade Volcano  because of its history of destructive eruptions and its proximity to several large towns, of which the closest are Garachico , Icod de los Vinos and Puerto de la Cruz. Before the Spanish colonization of Tenerife, the native Guanches referred to a powerful figure living in the volcano, which carries light, power and the sun.
It is one of several volcanoes which form the Campanian volcanic arc. Vesuvius consists of a large cone partially encircled by the steep rim of a summit caldera caused by the collapse of an earlier and originally much higher structure. The only surviving eyewitness account of the event consists of two letters by Pliny the Younger to the historian Tacitus.