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Why Do Ocean Currents Flow in Giant Circular Patterns?

为什么洋流会形成巨大的环形流动？

Ocean currents swirl in massive gyres—clockwise in the Northern Hemisphere and counterclockwise in the Southern—due to Earth’s rotation and wind patterns.
The Coriolis effect deflects moving water right in the north and left in the south, curving paths into circular loops.
Trade winds push surface water west near the equator, while westerlies drive eastward flow at mid-latitudes, closing the loop.
These gyres redistribute heat globally: the Gulf Stream carries warmth from the tropics to northern Europe, keeping it milder.
Plastic waste and marine life get caught in gyres too—creating ‘garbage patches’ where debris concentrates for years.
Deep-ocean currents, driven by temperature and salt differences, move more slowly but carry even more water than surface flows.
Together, surface and deep currents form the ‘global conveyor belt,’ taking about 1,000 years to complete one full cycle.
Melting polar ice may weaken this system by adding fresh water, potentially disrupting weather and ecosystems worldwide.

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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

Ocean currents swirl in massive gyres—clockwise in the Northern Hemisphere and counterclockwise in the Southern—due to Earth’s rotation and wind patterns. 洋流形成巨大的环流：北半球顺时针，南半球逆时针，由地球自转和风系驱动。
The Coriolis effect deflects moving water right in the north and left in the south, curving paths into circular loops. 科里奥利效应使北半球水流向右偏、南半球向左偏，路径因而弯曲成环形。
Trade winds push surface water west near the equator, while westerlies drive eastward flow at mid-latitudes, closing the loop. 信风推动赤道附近表层海水向西流动，西风则驱动中纬度海域向东流动，从而闭合环流。

④ 懂 · 选一选

这篇中文题目最接近哪一句？为什么洋流会形成巨大的环形流动？一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？洋流形成巨大的环流：北半球顺时针，南半球逆时针，由地球自转和风系驱动。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） Why Do Ocean Currents Flow in Giant Circular Patterns? How to cook noodles A maths worksheet

⑤ 今天会说这一句

Ocean currents swirl in massive gyres—clockwise in the Northern Hemisphere and counterclockwise in the Southern—due to Earth’s rotation and wind patterns.

⑥ 跟读并录音

Ocean currents swirl in massive gyres—clockwise in the Northern Hemisphere and counterclockwise in the Southern—due to Earth’s rotation and wind patterns.

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：Ocean currents swirl in massive gyres—clockwise in the Northern Hemisphere and counterclockwise in the Southern—due to Earth’s rotation and wind patterns.