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The Amazon Fan: Submarine Sediment Accumulation and Deep-Sea Biodiversity Corridors
亚马逊扇：海底沉积堆积与深海生物多样性廊道
精读先不看文字，完整听一遍。
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This massive underwater deposit extends over eight hundred kilometers into the South Atlantic Ocean.这一巨大的海底沉积体向南大西洋延伸超过八百公里。
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Sediment from the Amazon River settles in layers shaped by turbidity currents and bottom-water density flows.亚马孙河带来的沉积物在浊流和底层水密度流作用下，形成层状堆积。
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Graded bedding reveals episodic flood events that transport clay, silt, and organic matter offshore.粒级递变层理揭示了周期性洪水事件，将黏土、粉砂和有机质输送至离岸区域。
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Cold, oxygen-rich Antarctic Bottom Water flows over the fan, supporting chemosynthetic communities near seeps.寒冷富氧的南极底层水从扇体上方流过，支撑着渗漏区附近的化能合成生物群落。
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Submarine canyons incised into the fan serve as migration pathways for deep-sea fish and crustaceans.切入扇体的海底峡谷为深海鱼类和甲壳类提供了迁徙通道。
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Benthic biodiversity peaks where fine-grained sediments meet harder substrates near canyon walls.底栖生物多样性在细粒沉积物与峡谷壁附近较硬基底交界处达到峰值。
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Seafloor topography controls current velocity, which in turn regulates particle deposition and nutrient flux.海底地形控制着海流速度，进而调节颗粒沉降和营养盐通量。
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Methane hydrates occur beneath the fan’s outer reaches, stabilized by high pressure and low temperature.甲烷水合物存在于扇体外缘之下，由高压和低温环境稳定存在。
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Sediment compaction rates vary with grain size, affecting pore-water chemistry and microbial activity depth profiles.沉积物压实速率随粒径变化，影响孔隙水化学性质及微生物活性的垂向分布。
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Mapping acoustic backscatter helps distinguish sediment types linked to Amazon discharge variability over decades.声学后向散射测绘有助于区分与数十年来亚马孙径流变化相关的沉积类型。
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
- Benthic biodiversity peaks where fine-grained sediments meet harder substrates near canyon walls. 底栖生物多样性在细粒沉积物与峡谷壁附近较硬基底交界处达到峰值。
- This massive underwater deposit extends over eight hundred kilometers into the South Atlantic Ocean. 这一巨大的海底沉积体向南大西洋延伸超过八百公里。
- Graded bedding reveals episodic flood events that transport clay, silt, and organic matter offshore. 粒级递变层理揭示了周期性洪水事件，将黏土、粉砂和有机质输送至离岸区域。
④ 懂 · 选一选
⑤ 今天会说这一句
Benthic biodiversity peaks where fine-grained sediments meet harder substrates near canyon walls.
⑥ 跟读并录音
Benthic biodiversity peaks where fine-grained sediments meet harder substrates near canyon walls.
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：Benthic biodiversity peaks where fine-grained sediments meet harder substrates near canyon walls.
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。