Ka taƙaita labarin:  Yayin da rana ke faɗuwa a kan hamadar Sahara, launukanta suna haskakawa a kan manyan dunes na yashi wanda ya sa hasken bakan gizo ya yi rawa a fadin shimfidar wuri. Kuma NASA ta kama yadda wannan ban mamaki ya bayyana daga sararin samaniya ta amfani da Landsat 7 tauraron dan adam. Yana nuna 'ribbons' na yashi da zane-zane da aka sani da dunes na layi a cikin Erg Chech, teku mai yashi a kudu maso yammacin Aljeriya - amma ba a san ainihin dalilin waɗannan tsarin ba. Dunes na layi, kamar waɗannan da tauraron dan adam na Landsat 7 na NASA ya kama, madaidaiciyar dutsen ne na yashi wanda aka san cewa yana da nisan mil 99 (160km). Wannan hoton yana nuna 'ribbons' na yashi da zane-zane a wani yanki da aka sani da Erg Chech, wani teku mai yashi a kudu maso yammacin Aljeriya - amma ba a san ainihin dalilin wadannan gine-ginen ba. An gano hoton ta hanyar io9 kuma launuka sun haifar da hasken rana ya buga yashi kuma an nuna shi. Dunes na layi sune madaidaiciya madaidaiciya na yashi wanda aka san su don auna har zuwa mil 99 (160km). Ana rarraba ridges a matsayin madaidaiciya lokacin da suka fi tsayi fiye da yadda suke da faɗi, kuma suna faruwa ne a kan keɓaɓɓun ridges na dunes da kuma, mafi yawanci, a matsayin saiti na layi daya ridges rabu da mil na yashi da dutse. Dunes na layi sune madaidaiciya madaidaiciya na yashi wanda aka san su don auna har zuwa mil 99 (160km). Ana rarraba ridges a matsayin madaidaiciya lokacin da suka fi tsayi fiye da yadda suke da faɗi, kuma suna faruwa ne a kan keɓaɓɓun ridges na dunes da kuma, mafi yawanci, a matsayin saiti na layi daya ridges rabu da mil na yashi, dutse. An kuma san dunes don haɗuwa da kuma samar da abin da ake kira 'Y-shaped compound dunes', kuma ana haifar da samuwar waɗannan alamu ta hanyar iska da motsi na yashi. Amma ba a san ainihin yadda wannan iska take motsa abubuwa ba. An kuma san dunes don haɗuwa da kuma samar da abin da ake kira 'Y-shaped compound dunes', kuma ana haifar da samuwar waɗannan alamu ta hanyar iska da motsi na yashi. Amma ba a san ainihin yadda wannan iska take motsa abubuwa ba. Wani ka'ida,
Hoton da aka zana na zane-zane a cikin hamadar Sahara an kama shi ta hanyar tauraron dan adam na Landsat 7 na NASA. Misalai ne na madaidaiciya, ko tsayi, dunes a Erg Chech - teku mai yashi a kudu maso yammacin Aljeriya. 'Erg' ya fito ne daga kalmar Larabci don 'filin sand dunes' kuma ba a san dalilin irin waɗannan siffofin ba. Ka'idoji sun hada da ƙuƙwalwar ƙuƙwalwar ƙuƙwalwa - ƙuƙwalwar iska mai juyawa da kuma juyawa - da kuma sauye-sauye na yanayi a cikin iska.