跟讀練習: What Are Volcanoes and How Are They Formed? - 通過影片學習英語口語
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71 句
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Dramatic volcanic eruptions happen all around the world.
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Humans are left in both fear and awe of these fiery,
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powerful and highly dangerous events.
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Today, there are over 600 active volcanoes on Earth,
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with at least 50 eruptions occurring each year.
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But did you know there are many other volcanoes out there that are extinct or dormant?
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What is going on under the surface to cause such a destructive event?
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To answer this question, we must first understand what a volcano is.
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A volcano is essentially a rupture in the Earth's crust.
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the Earth's rocky outermost layer that lies on top of its hotter, inner layers.
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The Earth's crust and the upper mantle form the lithosphere.
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The lithosphere is broken up into slabs known as tectonic plates,
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and they fit together like puzzle pieces to make up the surface of the Earth.
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Most volcanoes are found along these tectonic plate margins,
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either at a destructive or constructive plate margin.
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Both of these margins allow gas and molten rock to escape from inside the planet to the surface.
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At a destructive or convergent plate margin,
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an oceanic tectonic plate which is a plate mostly covered by the sea,
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and a continental plate which is mostly covered by land,
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move towards each other.
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The denser oceanic plate sinks under the continental plate,
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melting down into the Earth's mantle.
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This melting releases gases that make their way through the crust above and erupt through the surface.
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At a constructive plate margin,
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the two plates move apart really slowly,
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less than 5 cm per year.
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But over time, this allows extremely hot magma to rise up from deep within the planet.
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Magma rises and fills the gaps created by the plates moving away from each other.
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And eventually, new crust is formed.
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Magma at the margin can sometimes explode through this new crust,
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creating a volcanic eruption.
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Many of these constructive margins are found under the ocean.
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If you map the locations of volcanoes,
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you'll see that 75% of the world's active volcanoes are along the margin of the Pacific Plate.
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Volcanologists refer to this as the Ring of Fire.
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Since 1850, approximately 90% of the 16 most powerful volcanic eruptions on Earth have occurred within the Pacific Ring of Fire,
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making it one of the most dangerous places on Earth.
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However, there are places on Earth where a volcano can form away from tectonic plate boundaries.
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We call these hotspot volcanoes.
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They form when rising magma from deep within the planet melts through the tectonic plate above and begins to build up.
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An example of this is the Hawaiian Islands,
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which are all made of a mixture of extinct and active volcanoes that have broken through the middle of the Pacific Plate.
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Now that you know where volcanoes form,
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let's learn about their different types.
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There are two main types,
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composite volcanoes and shield volcanoes.
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The majority of volcanoes are composite volcanoes.
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These are commonly found on destructive plate margins and have a distinctive conical shape.
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Let's slice a composite volcano in half to learn more about it.
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At the bottom of a composite volcano lies a magma chamber,
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which is like a hot bubbling furnace.
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Magma enters the chamber from the Earth's mantle and collects here until pressure builds,
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causing gases to expand and water to become steam.
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Eventually, the pressure becomes so high that an explosion, or volcanic eruption, occurs.
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Most of the magma moves through the main vent and exits the volcano through the crater.
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Some magma also makes its way through secondary vents and out through secondary cones.
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Craters can eject four different types of materials into the atmosphere.
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These include lava, which is the name for magma that has reached the surface of the earth,
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pieces of rocks called volcanic bombs, thick ash, and gas.
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With every eruption, the lava that travels out of the crater cools
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and solidifies along with ash to form alternate layers of ash and lava.
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Composite volcanoes are also known as stratovolcanoes, because strato means layers.
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Shield volcanoes, on the other hand,
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are usually found on constructive plate margins or at hot spots.
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They have gentle sloping sides caused by runny lava,
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flowing quicker and covering longer distances before it solidifies.
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They usually erupt less violently as compared to composite volcanoes.
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Volcanoes reflect the movements of Earth's major tectonic plates and are signs of activity occurring under the Earth's surface.
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This gives us evidence that the Earth is not just a static and rigid rock,
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but one full of dynamic and powerful forces.
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為什麼與這個影片練習口語？
與這個關於火山的影片練習口語，能讓你在掌握科學英語的同時，提升表達能力。通過模仿影片中的發音與語調，你不僅能增強自信心，還能幫助自己克服語言障礙。火山這一主題涵蓋了諸多科學概念，利用它來練習口語，不僅有趣，還能引發更深的思考，助你理解地球內部的動態。此外，瞭解火山的形成與型別也能豐富你的詞彙量，為參與更廣泛的討論做好準備。將這些知識應用於實際的對話中，有助於擴充套件你的交流能力。
語法與表達方式分析
在影片中，演講者使用了一些特別的語法結構與表達方式，以下是幾個重要的例子：
- 被動語態：例如：“火山是一種……”。這種結構強調了火山的定義而非發言者的行為。
- 複雜句：演講者經常使用從句，諸如“當海洋板塊和大陸板塊相遇時”，這使得句子結構更加豐富，更具邏輯性。
- 條件句：如“如果你對映火山的位置，你會看到……”，這種結構可以幫助聽眾理解因果關係。
- 進行時態：比如“正在釋放氣體”，這一點讓聽眾感受到正在進行的動作，增強了緊迫感和臨場感。
- 名詞短語：如“構造板塊邊緣”，這種用法精確地傳達了科學概念，提升了專業性。
常見的發音誤區
在火山影片中，某些詞彙的發音可能會給學習者帶來挑戰：
- Volcano（火山）：注意音節的重音，通常發音為/vɒlˈkeɪ.noʊ/。
- Destructive（破壞性）：這個詞的重音往往容易錯位，正確發音為/dɪˈstrʌk.tɪv/。
- Magma（岩漿）：注意避免將這個詞讀成“magna”，正確為/ˈmæɡ.mə/。
- Crust（地殼）：注意簡短且清晰的發音，通常為/krʌst/。
通過結合影片內容和上述要點，學習者可以利用這些資訊更有效地進行口語練習。運用著名的 shadowspeaks 技巧，將能夠顯著提高自己的英語表達能力，並增強與他人對話的流利度。通過 shadow speak 或 shadow speech 的方式來進行練習，確保你能夠在真實情境中運用所學的知識。
影片中的語法
說話人最常用的結構，並附上影片中的原話：
| 結構 | 影片中的用法 |
|---|---|
| 被動語態 be + 過去分詞 — 強調發生了什麼，而不是誰做的 | are left · is broken · are found |
| 現在完成時 have/has + 過去分詞 — 過去發生但與現在仍有關聯的事 | have occurred · have broken · has reached |
| 定語從句 who / which + 從句 — 補充說明人或事物 | plate which is · lava, which is |
什麼是跟讀法？
跟讀法 (Shadowing) 是一種有科學依據的語言學習技巧，最初開發用於專業口譯員的培訓，並由多語言者Alexander Arguelles博士普及。這個方法簡單而強大：您在聽英語母語原聲的同時立即大聲重複——就像是一個延遲1-2秒緊跟說話者的影子。與被動聽力或語法練習不同，跟讀法強迫您的大腦和口腔肌肉同時處理並模模擬實的講話模式。研究表明它能顯著提高發音準確性，語調，節奏，連讀，聽力理解和口語流利度——使其成為雅思口語備考和真實英語交流最有效的方法之一。