Violent volcanoes

1. Violent volcanoes By Brandon Swain

2. About Magma • Magma (from Greek "mixture") is a mixture of molten or semi-molten rock, volatiles and solids that is found beneath the surface of the Earth, and is expected to exist on other terrestrial planets. Magma often collects in magma chambers that may feed a volcano or turn into a pluton.

3. About lava’s temperature • Lava comes from the core in the middle of the earth. When first erupted from a volcanic vent, lava is a liquid at temperatures from 700 to 1,200 °C (1,292 to 2,192 °F). Up to 100,000 times as viscous as water, lava can flow great distances before cooling and solidifying because of its thixotropic and shea thinning properties.

4. About volcanoes that have erupted According to the Global Volcanism Program at the Smithsonian Institute, hundreds of volcanoes have erupted in the last century, but most of these eruptions were minor and did not garner much worldwide attention. Twelve, however, were large enough to cause major disruptions to local citizens, property damage or deaths.

5. About volcanoes ‘s nature • Volcanoes are one of nature's deadliest killers. Breathtakingly beautiful yet devastatingly fatal, volcanoes have fascinated human beings since time immemorial. They stand as permanent reminders of the fragility of the human race—constantly at the mercy of the unpredictable ruthlessness of the natural world. Volcanic eruptions create and destroy landscapes, fascinate and terrify observers, and can even control our climate. Explore the history of volcanoes, revealed in the world's 10 greatest eruptions.

6. Volcanoes • Volcanoes are usually cone shaped. • Magma rises through cracks or weaknesses in the earths crust. • Pressure builds up inside the earths. • Over time, after several eruptions, the rock builds up and a volcano forms. • The lava from the eruption cools to form new crust.