Information on volcano for school


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  • Information on volcano for school

    1. 1. Information on volcanoes<br />Social studies project<br />
    2. 2. Volcano – What is it<br />A volcano is an opening in the planet's surface or crust, which allows hot magma, volcanic ashes and gases to escape from below the surface. The most common perception of a volcano is of a conical mountain, spewing lava and poisonous gases from a crater at its summit.<br />
    3. 3. Volcano – Erupted Materials<br /> Magma is molten rock within the Earth's crust. When magma erupts through the earth's surface it is called lava. Lava can be thick and slow-moving or thin and fast-moving.<br />Rock also comes from volcanoes in other forms, including ash (finely powdered rock that looks like dark smoke coming from the volcano), cinders (bits of fragmented lava), and pumice (light-weight rock that is full of air bubbles and is formed in explosive volcanic eruptions - this type of rock can float on water).<br />
    4. 4. Difference between lava and magma<br />Magma is liquid rock inside a volcano.<br />Lava is liquid rock (magma) that flows out of a volcano. Fresh lava ranges from 1,300° to 2,200° F (700° to 1,200° C) in temperature and glows red hot to white hot as it flows.<br />
    5. 5. How many volcanoes are therein the world?<br />There are around 1510 'active' volcanoes in the world. We currently know of 80 or more which are under the oceans.<br />
    6. 6. What causes volcanoes to erupt?<br />The Earth's crust is made up of huge slabs called plates, which fit together like a jigsaw puzzle. These plates sometimes move.<br />Between the Earth's crust and the mantle is a substance called magma which is made of rock and gases.<br />When two plates collide, one section slides on top of the other, the one beneath is pushed down.  Magma is squeezed up between two plates.<br />Did you know? Volcanoes are like giant safety valves that release the pressure that builds up inside the Earth.<br />
    7. 7. Where are a large number of volcano found? <br />What is the Ring of Fire?<br />Over half of the world’s volcanoes arise in a belt around the Pacific Ocean called the Ring of Fire. <br />Which is the largest volcanic mountain?<br />Mauna Kea which is also worlds tallest mountain is the largest volcanic mountain.<br />
    8. 8. Effect of Volcanoes on people and the environment<br />As well as the danger from the hot lava, an erupting volcano can trigger are life threatening things.<br />tsunamis<br />flash floods<br />earthquakes<br />mud flows<br />rock falls.<br />
    9. 9. People and Volcanoes<br />Volcanoes can have a very serious effect on the lands and people around them when they erupt.<br />Buildings are destroyed and people are made homeless.<br />People are killed.<br />Clouds of ash cover plants making them inedible.<br />Poisonous gases kill people and animals.<br />Dust causes pneumonia and illnesses to the survivors.<br />Dark skies, severe winds and heavy rains may follow an eruption for months afterwards.<br />.<br />
    10. 10. Fact File<br />One in 10 people in the world live within 'danger range' of an active volcano.<br />People can get used to living near a volcano, but it is always a little dangerous. Scientists have estimated that at least 200,000 persons have lost their lives as a result of volcanic eruptions during the last 500 years.<br />People set up homes on the slopes of volcanoes because of the rich, fertile soil produced<br />
    11. 11. Social studies project <br />From Class 7th C group B on Volcano<br />