چرخه آب چیست؟

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چرخه آب چیست؟

چرخه آب یک جریان مداوم حرکت آب بین زمین، اقیانوس، رودخانه ها و نهرها و جو (اتمسفر) می باشد. آب همواره در اطراف و بالای زمین در حال چرخش است. آب همان طور که در این چرخه در حال حرکت می باشد از شکل مایع (آب باران، آب نمک) به گاز (بخار آب) و دوباره به مایع تبدیل می شود. این مایع ممکن است سرد شود و به شکل جامد درآید (یخ یا برف).

چرخه آب برای ادامه زندگی بر روی زمین ضروری است و در مدت میلیاردها سال است که این چرخه در طبیعت جریان دارد. آب از آن زمان تا کنون بارها تمیز شده است و منابع آبی زمین همواره از طریق فرایند طبیعی که ما آن را چرخه آب می نامیم، در حال تجدید شدن می باشند.


مراحل چرخه آب

1-تبخیر: وقتی که خورشید آب رودخانه ها یا دریاچه ها و یا اقیانوس ها را گرم می کند، آب یه شکل بخار در می آید. این بخار آب در جو بالا می رود.

2-تراکم: بخار آب در هوا سرد می شود و دوباره به قطرات مایع کوچک تبدیل می شود و ابرها تشکیل می شوند.

3-بارش: هنگامی که مقدار زیادی آب متراکم شوند به طوری که هوا نتواند وزن آن را تحمل کند، آب از ابرها به شکل باران، تگرگ یا برف دوباره به زمین بر می گردد.

4-نفوذ: وقتی که آب به صورت باران تگرگ یا برف می بارد، مقداری از آن به زمین نفوذ می کند.

5-رواناب: مقداری از آب به زمین فرو نمی رود بلکه در رودخانه ها و نهرها می ریزد.

6-تعریق: فرایندی که آب موجود در گیاهان و به ویژه برگ ها تبخیر می شود. تعرق کمک می کند که بخار آب به هوا بر گردد.

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