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Jal Chakra aur Bhoojal

Class 7 Science · Chapter 7: Prakriti mein Garmi ka Sthaanaantaran · NCERT Curiosity section 7.4

Seekho

Geele kapde dhoop wale din jaldi sookhte kyunki Sooraj ki garmi vaashpan tez karti. Yahi garmi samudra, nadi aur jheel se paani bhaap bankar uthaati; paudhe bhi vaashpotsarjan se bhaap jodte. Uthti bhaap thandi hokar sanghanit hoti aur baadal banti, jo baarish, barf ya ole laate: varsha.

Ye ant-heen chakra, bhaap bankar upar aur varsha bankar neeche, mitti, chattaan aur paudhon se hokar jalaashayon tak waapas, jal chakra hai. Ye nadi-jheel bharta aur Prithvi par kul paani barabar rakhta. Sadiyon pehle Ujjain ke khagolvid Varahamihira ne baadal, hawa aur aasmaan se mausami baarish ke anumaan ke tareeke bataaye.

Kabir teen kati bottlon mein chikni mitti, ret aur bajri bharkar har ek mein 200 mL paani daalta. Bajri se paani tezi se, ret se tapakkar, aur mitti se mushkil se nikalta. Zameen mein paani risna antahsravan hai; ye wahaan tez jahaan jagah chaudi aur judi. Zameen ke neeche chattaan aur avsaad ke chhidron mein jama hokar ye bhoojal banta, aquifer naam ki parton mein, jinse kuein paani lete.

Bhoojal asimit nahi. Bahut borewell, kam ped aur zyaada concrete jo baarish risne nahi deta, ise ghata rahe. Varsha jal sangrah aur recharge gaddhe ise bharte. Thande Ladakh mein log ice stupa banaate: sardi mein naale ka paani jamti hawa mein chhidakne se barf ke oonche shanku bante jo basant mein dheere pighalte, theek jab kheton ko paani chahiye.

Explore: paani kitna tez rista?

  1. Har ek se paani daalkar risne se sort karo.

Explore: jal chakra.

  1. Chakra ke kadam kram mein lagao.

Yaad rakho

  • Sooraj jal chakra chalaata: vaashpan aur vaashpotsarjan, sanghanan, varsha, aur waapsi.
  • Antahsravan aquifer mein bhoojal jama karta; varsha jal sangrah aur recharge gaddhe inhe bharte.

Quick check

Paani rakhne wali zameen ke neeche ki chattaan-avsaad parten kehlaati …

  1. aquifers
  2. glaciers
  3. clouds
  4. craters
Answer

aquifers. Kuein aur borewell aquifer se paani lete.

Socho

Poori pakki sadak wale shehar mein gaanv ke kheton se zyaada aasaani se baadh kyun?

Ek answer

Concrete antahsravan rokta, to baarish ka paani zameen mein nahi rista aur sataah par beh jaata.

Practice

Teen levels (easy, medium, hard) ke naye sawaalon se practice karo, kuch hands-on, hints aur hal ke saath. Topic poora karne ke liye pichhle 5 mein se 4 sahi karo.