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Periglacial Landscapes: Frost Action Shapes Terrain Beyond Glaciers
冻缘地貌:冰缘作用在冰川之外塑造地形
精读先不看文字,完整听一遍。
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Freeze-thaw cycles crack bedrock and sort stones into patterned ground without glacial ice.冻融循环使基岩开裂,并在无冰川冰的情况下将石块排列成有规律的地貌。
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Solifluction flows occur when waterlogged soil moves slowly over frozen subsoil on gentle slopes.当饱水土壤在缓坡上缓慢滑过冻结的下层土时,便发生泥流作用。
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Pingos—ice-cored hills—form where groundwater freezes and lifts overlying sediments upward.冰核丘是冰芯隆起形成的山丘,由地下水冻结并抬升上覆沉积物而成。
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Patterned ground includes polygons, stripes, and circles shaped by differential frost heave intensity.多边形、条带和环状等有规律的地貌,由差异性冻胀强度塑造而成。
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Permafrost degradation thaws previously stable slopes, triggering retrogressive thaw slumps in Arctic tundra.多年冻土退化使原本稳定的斜坡解冻,从而在北极苔原引发后退式热融滑塌。
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Rock glaciers move imperceptibly slow but transport debris far beyond active glacier termini.石冰川移动极其缓慢,却能将碎屑搬运至活跃冰川末端之外很远的地方。
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Frost wedging dominates erosion in high-altitude deserts where snow cover is thin but temperature swings extreme.在积雪稀薄但温差极大的高海拔沙漠中,冻融风化是主要侵蚀方式。
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Thermokarst lakes form when ground ice melts, leaving depressions that fill with rainwater and runoff.地下冰融化后形成凹陷,雨水和径流注入其中,便发育为热融湖。
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These landscapes span latitudinal bands where mean annual temperatures hover near zero degrees Celsius.这些地貌分布于年均气温接近0℃的纬度带。
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Remote sensing now tracks periglacial change rates to model future terrain instability under warming.遥感技术现已用于监测冻缘区变化速率,以模拟气候变暖下的未来地形失稳。
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
- Pingos—ice-cored hills—form where groundwater freezes and lifts overlying sediments upward. 冰核丘是冰芯隆起形成的山丘,由地下水冻结并抬升上覆沉积物而成。
- Freeze-thaw cycles crack bedrock and sort stones into patterned ground without glacial ice. 冻融循环使基岩开裂,并在无冰川冰的情况下将石块排列成有规律的地貌。
- Patterned ground includes polygons, stripes, and circles shaped by differential frost heave intensity. 多边形、条带和环状等有规律的地貌,由差异性冻胀强度塑造而成。
④ 懂 · 选一选
⑤ 今天会说这一句
Pingos—ice-cored hills—form where groundwater freezes and lifts overlying sediments upward.
⑥ 跟读并录音
Pingos—ice-cored hills—form where groundwater freezes and lifts overlying sediments upward.
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:Pingos—ice-cored hills—form where groundwater freezes and lifts overlying sediments upward.
已记下。连续天数以后会显示在课表里。
陈老师指导
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