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・ Crater (Chinese astronomy)
・ Crater (constellation)
・ Crater 101
・ Crater Bay
・ Crater chain
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・ Crater Club
・ Crater Confederate order of battle
・ Crater counting
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Crater Hill
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・ Crater Lake (disambiguation)
・ Crater Lake (Idaho)
・ Crater Lake (South Shetland Islands)
・ Crater Lake Lodge
・ Crater Lake National Park
・ Crater Lake newt
・ Crater Lake Superintendent's Residence
・ Crater Lakes National Park
・ Crater National Forest


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Crater Hill : ウィキペディア英語版
Crater Hill

Crater Hill is one of the volcanoes of the Auckland Volcanic Field. It consists of an explosion crater about 600m wide, partly filled with water.
Late in the eruption sequence lava welled up inside the explosion crater creating a lava lake. This lake began cooling on the surface and around the edge, creating a solid basalt crust. When the molten lava withdrew back down the volcano's throat, the crust surface collapsed, creating the island in the middle of the present lake, and some of the solid basalt was left around the inside walls of the crater marking the former level of the lava lake. Two lava caves – Selfs and Underground Press Lava Caves – exist beneath the remnant crust on the south side of the crater. Quarrying has removed the small scoria cone in the crater and some of the tuff ring on the northeast side. The Southwestern Motorway was cut through the northeast crater rim and a small explosion crater.
==References==

*''City of Volcanoes: A geology of Auckland''. Searle, Ernest J.; revised by Mayhill, R.D.; Longman Paul, 1981. First published 1964. ISBN 0-582-71784-1.
*''Volcanoes of Auckland: The Essential Guide''. Hayward, B.W., Murdoch, G., Maitland, G.; Auckland University Press, 2011.


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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