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1jdjdjd1
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A Mind-Map on Volcanoes!

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1jdjdjd1
Created by 1jdjdjd1 over 11 years ago
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Volcanoes

VolcanoesFormation of avolcano1. Hot liquid rock called magma reaches the surface of theground through a narrow vent in the earth's crust.2. It erupts violently, blasting lava, ashand boiling mud into the air.3. This material collects arounda vent in a cone shape.4. Repeated lava flows add to thiscone-shaped mass of material.5. Together the repeated ash and lavalayers build up to form a cone-shapedmountain.Positive effects ofvolcanoes1. New land is created for farming andliving space, e.g. Iceland.2. Minerals are created by volcanic activity.Lava soils are rich in minerals. Good forgrowing crops.3.Geysers(hot spring) can be formed and helpheat glasshouses for production of food. E.g.Iceland.4. Dormant or extinct volcanoes are majorcentres of tourism. e.g Vesuvius in Italy.Negative effects of volcanoes1. When snow-capped volcanoes erupt,large mud flows are created, which oftencover villages and towns.2. Gases from volcanoes may killpeople who live nearby.3. Ash and lava flows can destroy townscausing death.4. Giant tidal waves are created by volcanoes at sea.When they reach land they can kill people especiallyin low-lying places such as deltas.Types of volcanoActiveDormantExtinctErupting regularly, e.g. Mount Helens inCalifornia.Has not erupted in a long time. Mayerupt again.Has not erupted over thousands ofyears. Will most probably not eruptagain.KeywordsMagmaGeyserVentashCraterPacific Ring of FireLargest earthquake andvolcano zone is called thePacific Ring of Fire. It liesaround the edge of the PacificOcean.Double click this nodeto edit the textClick and drag this buttonto create a new node