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Why Some Volcanic Islands Grow Larger After Eruptions — Instead of Shrinking
为何某些火山岛在喷发后反而变大而非缩小
精读先不看文字,完整听一遍。
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Most people think eruptions destroy land — but underwater lava flows can add new coastline rapidly.多数人认为火山喷发会破坏陆地,但水下熔岩流却能迅速增添新海岸线。
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When hot basalt erupts into cold seawater, it cools fast and builds steep, glassy cliffs called pillow lava.当炽热的玄武岩喷入冰冷海水中时,会迅速冷却,形成陡峭、玻璃质的枕状熔岩悬崖。
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Repeated underwater eruptions pile up layers that eventually break the sea surface as new land.反复的水下喷发层层堆积,最终突破海面,形成新陆地。
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Hawaii’s Big Island grew over 500 acres during the 2018 Kīlauea eruption thanks to such flows.夏威夷大岛在2018年基拉韦厄火山喷发中,因这类熔岩流新增了500多英亩土地。
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Unlike explosive ash clouds, quiet effusive eruptions push out dense rock that doesn’t blow away.与爆炸性火山灰云不同,宁静式溢流喷发涌出致密岩石,不会被吹散。
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Scientists measure island size changes using satellite radar and drone photogrammetry.科学家利用卫星雷达和无人机摄影测量技术监测岛屿面积变化。
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Some islands shrink later due to wave erosion — but initial growth is real and measurable.部分岛屿后期会因海浪侵蚀而缩小,但初期增长真实且可测量。
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Lava deltas form where rivers of molten rock enter the sea and steam violently on contact.熔岩三角洲形成于熔岩河流入海处,接触海水时剧烈汽化产生蒸汽。
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These deltas are unstable at first but harden quickly into solid basalt platforms.这些三角洲初时不稳定,但很快硬化为坚实的玄武岩平台。
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Geologists monitor new lava entries closely because sudden collapses can trigger deadly steam explosions.地质学家密切监测新熔岩入海口,因突发坍塌可能引发致命蒸汽爆炸。
精读 · 大约 10 分钟
听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。
③ 学 · 重点表达
- Scientists measure island size changes using satellite radar and drone photogrammetry. 科学家利用卫星雷达和无人机摄影测量技术监测岛屿面积变化。
- These deltas are unstable at first but harden quickly into solid basalt platforms. 这些三角洲初时不稳定,但很快硬化为坚实的玄武岩平台。
- Geologists monitor new lava entries closely because sudden collapses can trigger deadly steam explosions. 地质学家密切监测新熔岩入海口,因突发坍塌可能引发致命蒸汽爆炸。
④ 懂 · 选一选
⑤ 今天会说这一句
Scientists measure island size changes using satellite radar and drone photogrammetry.
⑥ 跟读并录音
Scientists measure island size changes using satellite radar and drone photogrammetry.
第一版:录下来、回听、再听标准音。系统打分以后再加。
⑦ 说 · 自己来一句
用今天的表达,自己说一句。
例子:Scientists measure island size changes using satellite radar and drone photogrammetry.
已记下。连续天数以后会显示在课表里。
陈老师指导
课程开发中,敬请期待。成人和孩子都可以先自学听读、精读。
这边的讲解音轨还在做。想先跟着老师走完固定 30 课,可以去陈老师带读社(和自学通行不是同一份会员)。
课程开发中,敬请期待。