20/09/18
VOLCANOES
How are volcanoes formed?
Volcanoes are formed when magma from within the Earth's upper mantle works its way to the surface. At the surface, it erupts to form lava flows and ash deposits. Over time as the volcano continues to erupt, it will get bigger and bigger.
Are there any active volcanoes in New Zealand
Ngauruhoe
Ngauruhoe is the largest, youngest and most active cone of the much larger Tongariro Volcano complex. It lies within Tongariro National Park between Tongariro to the north and Ruapehu to the south. At 2291m high it is the highest point of the Tongariro complex.
when did it last erupt
Typically Ngauruhoe has erupted at least every 9 years but there has been no eruption since 1975, and the last lava flow from Ngauruhoe was in 1954.
affect on the area
In 1973 red hot blocks of lava were ejected and during 1974 and 1975 ash eruptions continued with lava blocks thrown as far as 3km away.
what happens to volcanoes the which are extinct
Volcanoes go dormant because magma from the Earth's mantle can no longer reach the volcano. For example, in Hawaii, the line of islands are slowly moving to the northwest. Meanwhile, the supply of magma stays in the same place within the Earth, which currently happens to lie beneath the Big Island.
why do the volcanoes extinct ?
Extinct volcanoes haven't erupted for tens of thousands of years, and aren't expected to erupt again. ... The tectonic plate carrying the islands is slowly moving, so that volcanoes are cut off from the hotspot underneath.
cool and interesting facts about volcanoes
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