himyug

himyug ke dauraan barf ki chaadar ka failaav
aintaarkatika par barf ki chaadar

himyug ya himaaniyon ka yug pruthvi ke jeevan mein aane vaale aise yugon ko kehte hain jinmein pruthvi ki satah aur vaayumandal ka taapamaan lambe arason ke liye kam ho jaata hai, jis se mahaadveepon ke bade bhoobhaag par himaaniyaaain (gleshiyr) fail jaate hain. aise himyug pruthvi par baar-baar aayein hain aur vijnyaaanikon ka maanana hai ke yeh bhavishya mein bhi aate raheinge. aakhri himyug apni charam seema par ab se lagbhag 20,000 saal poorv tha. maana jaata hai ki yeh himyug lagbhag 12,000 varsh poorv samaapt ho gaya, lekin kuchh vaigyaaniko ka kehna hai ki greenalaind aur aintaarkatika par abhi bhi barf ki chaadarein hone ka arth hai ki yeh himyug apne antim charanon par hai aur abhi samaapt naheen hua hai.[1] jab yeh yug apne charam par tha to uttari Bhaarat ka kaafi kshetr himaaniyon ki barf ki moti tah se hajaaron saal tak dhaka hua tha.[2]

anukram

anya bhaashaaoain mein

angreji mein "himyug" ko "aais ej" (ice age) kehte hain.

mukhya him yug

vaigyaaniko ko paaainch bade himyug gyaat hain:

  • hyuronaai himyug (Huronian Iceage): yeh sab se praacheen gyaat himyug tha aur lagbhag 2.4 se 2.1 arab varsh pehle aapne charam par tha. ismein bahut hi bhayankar sardi hui thi aur yeh himyug lambe arase tak raha.
  • kraayojainaai himyug (Cryogenian Iceage): yeh aaj se lagbhag 85 se 63 karod varsh poorv hua aur pichhle ek arab varshon ka sab se bhayankar himyug maana jaata hai. ismein poori pruthvi barf se dhak gayi thi aur maana jaata hai ke us samay antariksh se dekhne par yeh ek poora safed barf ka gola nazar aati.
  • aindeeyaai-sahaaravi himyug (Andean-Saharan Iceage): yeh ek chhota himyug tha jo aaj se lagbhag 46 se 43 karod saal pehle ghata.
  • karoo himyug (Karoo Iceage): yeh 36 se 26 karod varsh poorv ghata. us samay pruthvi par vanaspati aur paudhe bahut ghane aur vistrut ho gaye. pruthvi ke vaayumandal mein kaarban daaioksaaid kam aur oksijn ki maatra bahut zyaada ho gayi thi, jis se dharati ka taapamaan kaafi gir gaya aur himyug aarambh ho gaya.
  • kvaatarnari himyug (Quaternary Iceage): yeh vah himyug hai jo abhi chal raha hai aur lagbhag 25 lakh varsh poorv aarambh hua tha. is himyug mein taapamaan aur him ka prakop oopar-neeche hota raha hai, jis se samudron ka paani bhi oopar-neeche uthata raha hai.

inhein bhi dekhein

sandarbh

  1. Singh. "The Pearson Bhartiya Itihas". Pearson Education India, 2008. aai॰aऍsa॰abee॰aऍna॰ 9788131708910. http://books.google.com/books?id=zGmPcCB9xlwC. "... 12000 varsh poorv antim himyug samaapt ho gaya ..."
  2. Indian Museum. "A guide to the geological galleries of the Indian Museum, Calcutta". Board of Trustees, Indian Museum, 1963. http://books.google.com/books?id=kUbwUTvvzdkC. "... During the Pleistocene period which corresponds to the Great Ice Age and which followed the Tertiary, the northern part of India was covered by glaciers and the entire continent experienced the rigors of extreme cold ..."