1.Describe the composition of "magma".

2.Describe the drifferent type of "lava".

3.Describe the different type of "pyrolastic material".

4.Describe the different type of "volcano".

5.Describe "The ring of fire".




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  • 匿名使用者
    1 0 年前


    1.Describe the composition of "magma".Magma is molten rock often located inside a magma chamber beneath the surface of the Earth. Magma is a complex high-temperature silicate solution that is ancestral to all igneous rocks.2.Describe the drifferent type of "lava".Lava is molten rock that a volcano expels during an eruption. Lava, when first exuded from a volcanic vent, is a liquid at very high temperature: typically from 700°C to 1200°C (1300°F to 2200°F). Although the viscosity of lava is 100,000 times that of water, the viscous rock can flow many miles before eventually cooling and solidifying.3.Describe the different type of "pyrolastic material".Pyroclastic material is another name for a cloud of ash, lava fragments carriedthrough the air, and vapor. Such a flow is usually *very* hot4.Describe the different type of "volcano".A volcano is a geological landform (usually a mountain) where magma (rock of the Earth's interior made molten or liquid by extremely high temperatures along with a reduction in pressure and/or the introduction of water or other volatiles) erupts through the surface of the planet. 5.Describe "The ring of fire".Volcanic arcs and oceanic trenches partly encircling the Pacific Basin form the so-called Ring of Fire, a zone of frequent earthquakes and volcanic eruptions. The trenches are shown in blue-green. The volcanic island arcs, although not labelled, are parallel to, and always landward of, the trenches. For example, the island arc associated with the Aleutian Trench is represented by the long chain of volcanoes that make up the Aleutian Islands.http://pubs.usgs.gov/publications/text/fire.html

    參考資料: www.wikipedia.com
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