Earthquakes And Volcanoes Essay

Earthquakes And Volcanoes Essay-37
The other active volcanoes near Australia are in New Zealand, Papua New Guinea, Indonesia and the Philippines.Gas-rich sticky magmas dominate the Asia Pacific, making composite volcanoes and calderas the most common varieties in the region.

The other active volcanoes near Australia are in New Zealand, Papua New Guinea, Indonesia and the Philippines.Gas-rich sticky magmas dominate the Asia Pacific, making composite volcanoes and calderas the most common varieties in the region.

This generates little volcanic activity (there is no "gap" between the plates) or mountain building. Much magma is generated at a converging plate boundary where subduction is occurring.

The sinking plate melts as it descends into the asthenosphere; this generates magma, which rises through the other plate to form volcanoes. Helens, Mt Hood, and many others are all part of this chain.

We almost never see these volcanoes, because most of them are located on the sea floor.

At converging plate boundaries, two situations are possible.

lava flows, ash fall, pyroclastic flows, climate changes on a global scale) that relate into different dangers or risks.

Earthquakes And Volcanoes Essay Determinism Essay

Most earthquakes and volcanoes occur because of the movement of the plates, especially as plates interact at their edges or boundaries. Normally, we have more earthquakes than any other region in the United States (including California) because we sit on top of one of the most active faults in the USA, but these earthquakes are extremely small and cannot be felt or heard. I am from Oklahoma and currently live in Norman, OK and we have had 65 "felt/registered" earthquakes in the past year; quite unusual. The explosiveness of a volcanic eruption depends on how easily magma can flow and the amount of gas trapped within the magma is released.Large amounts of water and carbon dioxide are dissolved in magma causing it to behave in a similar way as gas expanding in fizzy drinks, which forms bubbles and escapes after opening.A volcano is dormant if it has not erupted for a long time but could erupt again in the future.Once a volcano has been dormant for more than 10 000 years, it is termed extinct.The Cascade Range in the Pacific Northwest of the United States is a good example. A volcano is a vent or chimney which transfers molten rock known as magma from a depth to the Earth’s surface.Magma erupting from a volcano is called lava and is the material which builds up the cone surrounding the vent.A volcano is active if it is erupting lava, releasing gas or generates seismic activity.

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