Volcano and Lava Flow

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  • Topic: Volcano, Lava, Basalt
  • Pages : 1 (400 words )
  • Download(s) : 27
  • Published : November 14, 2009
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This presentation will discuss two questions which are
How is Lava Produced? And
What hazards/dangers does lava pose?
It will also study one example of a Lava Flow in Hawaii.
Lava is molten rock expelled by a volcano during erupting. It is produced/ formed in the interior of planets including Earth and their satellites. When the lava is first erupted from the vent in a volcano otherwise known as the volcanic vent, lava is a liquid and varies from 700°C to 1,200°C. Although lava is quite viscous, it can flow great distances before cooling and solidifying. This is because of its thixotropic and shears thinning Lava flows are quite hazardous and dangerous. The amount a lava flow travels depends on its temperature, its silica content, its extrusion rate, and slope of the land. Lava flows move slowly enough for people to move out the way so people rarely get killed by them. However lava is very hot and can therefore cause quite serious injuries. People have burnt their skin, charred their eyebrows, and melted the soles of their boots from being near or on a hot lava flow. Lava flows don't cool instantly. It can take any amount of time for a lava flow to completely cool.

Another hazard associated with lava flows is that they can melt snow and ice which can produce flooding. Melting of ice beneath a glacier may produce very large floods called glacier bursts. The biggest hazard of lava flows is that they destroy property. In the late 1980's, the town of Kalapana was destroyed by lava flows. Lava flows buried cars and burnt homes, buildings, and vegetation. Electric power, water, and communications were cut off from the community. One recent example of a lava flow was in the late 1980’s in the town of Kalapana, Hawaii which was once a treasured Hawaiian fishing village. The lava engulfed homes, parks and roads. Almost everything in its way was destroyed however a few homes survived due to sheer luck. For some strange reason, the lava would part or...
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