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Initially, Arkansas bauxite met 90% of US aluminum demand. Underground mining before and during World War II gave way to open pit mining in the 1960s. During the war, up to six million tons were mined in 1943. Arkansas bauxite mines were often passed over in favor of higher quality bauxite reserves in the Caribbean and mining ceased in 1982.
Boulder Glacier, Mount Baker. There are around 880 glaciers in Washington state, with 186 named according to the Geographic Names Information System (GNIS). [6] However, the 1980 eruption of Mount St. Helens eliminated nine of its eleven named glaciers and only the new glacier known as Crater Glacier has been reestablished since. Olympic Mountains
An inventory of South Island glaciers compiled in the 1980s indicated there were about 3,155 glaciers with an area of at least one hectare (2.5 acres). [14] Approximately one sixth of these glaciers covered more than 10 hectares.
This time period was called the Mid-Miocene Climatic Optimum (MMCO). By 14 million years ago, the Antarctic ice sheets were similar in size and volume to present times. [5] Glaciers were starting to form in the mountains of the Northern Hemisphere. [5] Between 3.6 and 3.4 million years ago, there was a sudden but brief warming period. [5]
The velocity at which the glacier moves is only about 25 to 30 cm (9.8 to 11.8 in) per year in its central section [10] and there is hardly any movement of glacial mass at lower altitudes. On the steep flanks of the Schneefernerkopf the flow rate can be several metres per year, but here the glacier has all but disappeared in recent years; its ...
Arkansas's record high is 120 °F (49 °C) at Ozark on August 10, 1936; the record low is −29 °F (−34 °C) at Gravette, on February 13, 1905. [16] Arkansas is known for extreme weather and frequent storms. A typical year brings thunderstorms, tornadoes, hail, snow and ice storms.
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The seas of southern and eastern Arkansas began to shrink during the early Cenozoic. Sharks and oysters were still present in its sea waters. [4] During the Eocene epoch, Arkansas was home to a marine invertebrate fauna that included echinoderms, Ostrea, and Turritella. The echinoderm fossils were preserved in the Bradford area of Jackson County.