mountain that may look more like a hill and is made mostly of lava not ash. A cinder cone volcano are built of lava that is "gas-charged" and shoots out clumps of lava from its vent which quickly solidifies and fractures in to many parts. Interesting characteristic of the lava is that they dont drop as liquid but as a circular or oval cone. Other kinds of Volcanos include a shield volcano that is typically large and has slow flowing liquid lava and a composite volcano. Composit volcanoes are steep and
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top in a major way. Until 2011‚ when Europe’s largest active volcano spewed hot lava for two hours Mount Etna is Europe’s highest and most active volcano. Towering above the city of Catania on the island of Sicily‚ it has been growing for about 500‚000 years and is in the midst of a series of eruptions that began in 2001. It has experienced a variety of eruption styles‚ including violent explosions and voluminous lava flows. More than 25% of Sicily’s population lives on Etna’s slopes‚ and it is the
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probably been many different types of rocks. Igneous rocks form from cooling lava or magma. Igneous rocks that cool from lava have a much shorter cooling time than rocks that cool from magma‚ this is because magma is underneath the earths surface and lava is above the surface. Lava is exposed to much cooler temperatures than it had in the middle of the volcano so it cools much quicker. Since igneous rocks made from lava cool much quicker they have a smaller crystal size. An igneous rock that formed
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which consist of a runny lava that flows with ease from the volcano. There are Strombolian eruptions that eject lava and rocks into the air. There are Vulcanian eruptions which are very explosive. It all depends on the viscosity of the magma‚ and the amount of gas that will determine what type of eruption. Igneous rocks form when the magma or lava cool down. There are two types of igneous rocks. They are either intrusive or extrusive. Extrusive igneous rocks form when the lava cools on the Earth’s surface
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Finally‚ they drove up the igneous road to see the very top of the volcano above them‚ the glow of the molten lava shining above and around the rim‚ the gleam even more notable against the dimmed sky. Caroline parked where the path ended and unlocked the doors. She turned to Rachel‚ who was about to open the door but turned to her when she felt her gaze. “Good luck‚” Caroline wished her‚ and she nearly missed Rachel’s quick twitch of a smile. “Thanks‚” she responded with a curt nod before opening
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EXPLORING LOIHI: THE NEXT HAWAIIAN ISLAND Twenty-one miles off the Big Island‚ nearly 3‚000 feet beneath the waves‚ an island is struggling to be born. Researchers are taking submersibles to the very bottom of the sea to watch the process unfold. Quiet as a falling pebble‚ the Pisces V submersible begins its descent to the ocean floor. Soon the downwelling light wanes and the pilot and a pair of scientists inside are swallowed up in inky blackness - a darkness as absolute as interstellar space
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-transform The areas where mantle plumes come to the surface are called what? -hotspots Much fluid basaltic lava erupts on the seafloor at mid-ocean ridges. Such eruptions pose little risk to humans because almost all of these occur at the bottom of the ocean. The island of Iceland‚ where a midocean ridge coincides with a hot spot‚ is an exception. Much fluid basaltic lava erupts on the seafloor at mid-ocean ridges. Such eruptions pose little risk to humans because almost all of these
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are mountains‚ typically conical‚ where lava comes out from a magma chamber through a crater or a vent. There are two types of volcanoes; Composite and Shield. A composite volcano can be referred to as a cone volcano. These volcanoes have tall narrow cone and a wide base. Their magma chambers contain thick acidic lava‚ which means sometimes you can walk faster than the lava when it is moving! The layers of a cone volcano are usually alternated between lava and ash. A shield volcano usually has a
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conditions. The island has about 130 volcanic mountains‚ of which 18 have erupted since the settlement of Iceland in 874 AD. Over the past 500 years‚ Iceland’s volcanoes have erupted a third of the total global lava output.[1] Although the Laki eruption in 1783 had the largest eruption of lava in the last 500 years‚ the Eldgjá eruption of 934 AD and other Holocene eruptions were even larger. |
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Analyse the factors that cause differences in the hazards posed by volcanoes around the world (40 marks) Your main factors can be put into two simple categories. Human and physical. From there you can then further explore the factors. In my essay I will mainly focus on viscosity‚ location‚ settlement and perception and explore how the physical and human factors intertwine with each other through one simple idea that physical factors dictate the hazard while human factors exacerbate the hazard. From
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