Author Archives: laceymarie1987

Please tell me about Mount Cameroon

Volcanoes in Cameroon are part of the Cameroon line, a chain of volcanoes extending from Annobon Island in the Atlantic Ocean northeastward through Cameroon.  The oldest rocks have been dated at 70 million years old.  Nine volcanoes along the line … Continue reading

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Do Hawaiian volcanoes explode like Mt. St. Helens?

Hawaiian Volcanoes will not explode like Mount St. Helens. Mount St. Helens magma is more viscous. Therefore gas cannot escape as readily, resulting in explosive eruptions. One index of explosivity is volume of eruption. Since the start of the current … Continue reading

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What are some good things that volcanoes do?

That’s a good question. I guess the main good effect that volcanoes have on the environment is to provide nutrients to the surrounding soil. Volcanic ash often contains minerals that are beneficial to plants, and if it is very fine … Continue reading

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What is the greatest amount of lava that has ever erupted from any volcano?

Probably the largest historic lava flow was erupted in Iceland from part of the Grimsvotn volcano system called Laki. Thorvaldur Thordarson and Steve Self calculated a lava flow volume of 14.7 cubic kilometers of lava.

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What’s the most recent eruption of Vesuvius and will it erupt again?

  Photo by Italian Air Force from Green and Short (1971). Vesuvius has erupted about three dozen times since 79 A.D., most recently from 1913-1944. The 1913-1944 eruption is thought to be the end of an eruptive cycle that began … Continue reading

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Why are there so many volcanoes in the Pacific Northwest and Alaska?

  The distribution of volcanoes in the northwest and Alaska is the result of plate tectonics. In the northwest, the oceanic Farallon Plate is being pushed beneath (subducted) the continental margin of the North American Plate. When the subducted plate … Continue reading

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How do volcanoes affect the atmosphere and climate?

This photo shows the large white billowing eruption plume from Rabaul being carried in a westerly direction by the weak prevailing winds. At the base of the eruption column is a layer of yellow-brown ash being distributed by lower level … Continue reading

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