跟讀練習: Types of Volcanoes - 通過影片學習英語口語

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Volcanoes are natural openings in the Earth's surface where molten rock, called magma, escapes from beneath the crust.
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During a volcanic eruption, gas and ash are often released along with lava, blasting into the atmosphere and spreading over large areas.
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These eruptions can vary from gentle lava flows to violent explosions.
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Volcanoes come in different shapes and sizes, depending on how they erupt and what kind of material they release.
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There are cinder cones, lava domes,
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shield volcanoes, stratovolcanoes, calderas, and fissure volcanoes.
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Let's explore the six main types of volcanoes, along with some real-world examples.
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Cinder cone volcanoes are the smallest type.
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They form when lava is ejected violently into the air, breaking into small fragments called cinders that fall around the vent.
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This builds a steep-sided cone.
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A good example is Periquatin in Mexico, which erupted in 1943 and grew over 400 meters high in just a few years.
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Lava dome volcanoes form when thick, viscous lava is slowly squeezed out of the vent.
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Instead of flowing far, the lava piles up near the opening, creating a dome shape.
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shape.
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An example is the lava dome that formed inside the crater of Mount St. Helens after its 1980 eruption.
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Shield volcanoes have wide, gentle slopes.
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They are built by low-viscosity lava that flows over great distances before cooling.
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These volcanoes are usually very large in size.
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The Mauna Loa Volcano in Hawaii is one of the most well-known shield volcanoes in the world, and also one of the most massive.
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Stratovolcanoes, or composite volcanoes, are tall,
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symmetrical volcanoes made up of alternating layers of lava, ash, and volcanic rock.
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They often have explosive eruptions due to thicker, gas-rich magma.
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Mount Vesuvius in Italy and Japan's famous Mount Fuji are classic examples of stratovolcanoes.
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A caldera forms when a massive eruption empties a magma chamber beneath the volcano volcano.
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With no support underneath, the surface collapses inward, creating a large depression.
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Crater Lake in Oregon, USA, is a caldera that formed when Mount Mazama erupted around 7,700 years ago.
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Fisher volcanoes don't form a central cone.
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Instead, magma rises through long cracks in the Earth's crust, called fissures, and erupts along a linear vent.
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These eruptions can produce large, widespread lava flows.
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One of the most well-known recent examples is the Fagradalsfjall fissure in Iceland, which began erupting in 2021.
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There are also submarine volcanoes on the ocean floor.
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They are the most common type of volcano on Earth, but they're often unnoticed because they lie underwater.
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These volcanoes can build up over time and occasionally form new islands, the most famous example being the Hawaiian Islands,
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which were formed by volcanic activity rising from a hot spot beneath the Pacific Ocean.
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Volcanoes come in many forms, each with its own shape,
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behavior and story, revealing just how diverse and dynamic our planet truly is.
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Thank you.

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