Cov kev thim rov qab no yog qhov tsis sib xws uas tsis muaj lub sijhawm pom tseeb rau lawv qhov tshwm sim. Lawv tuaj yeem tshwm sim ntau zaus raws li txhua 10 txhiab xyoo lossis yog li thiab tsis tshua muaj li txhua 50 lab xyoo lossis ntau dua. Qhov kev thim rov qab kawg yog kwv yees li 780, 000 xyoo dhau los.
Magnetic reversal tshwm sim li cas?
Cov kev sib nqus sib nqus no, nyob rau hauv qhov kev taw qhia ntawm thaj chaw yog flipped, ntseeg tau tias yuav tshwm sim thaum me me, kev hloov pauv ntawm cov hlau nplaum hauv lub ntiaj teb cov kua dej sab nraud cuam tshuam nrog lub ntiaj teb lub ntsiab dipolar magnetic teb. mus txog qhov twg lawv tau hla dhau, ua rau nws thim rov qab.
Puas sib nqus rov qab tshwm sim txhua xyoo?
Raws li qhov teeb meem ntawm cov ntaub ntawv geological, lub ntiaj teb magnetic teb tau dhau los ntawm ntau qhov rov qab ntawm polarity. Peb tuaj yeem pom qhov no hauv cov qauv sib nqus pom nyob rau hauv pob zeb volcanic, tshwj xeeb tshaj yog cov uas tau rov qab los ntawm cov dej hiav txwv. Hauv 10 lab xyoo dhau los, tau muaj, qhov nruab nrab, 4 lossis 5 thim rov qab ib lab xyoo
Thaum twg qhov kawg sib nqus rov qab tshwm sim?
Qee lub sij hawm, vim li cas cov kws tshawb fawb tsis nkag siab tag nrho, cov hlau nplaum yuav tsis ruaj khov thiab nws cov ncej qaum teb thiab sab qab teb tuaj yeem tig. Qhov kev thim rov qab loj kawg, txawm tias luv luv, tau tshwm sim ncig 42,000 xyoo dhau los.
Yuav ua li cas rau peb thaum sib nqus reversal tshwm sim?
Nov yog qhov tshwm sim thaum cov ncej hlau nplaum tig dhau los. … Qhov no tuaj yeem ua rau lub ntiaj teb tiv thaiv magnetic teb tsis muaj zog txog li 90% thaum lub sij hawm tus polar ntxeev. Lub ntiaj teb magnetic teb yog dab tsi tiv thaiv peb ntawm qhov chaw teeb meem hluav taws xob uas tuaj yeem ua rau cov hlwb puas, ua rau mob qog noj ntshav, thiab kib cov hluav taws xob hluav taws xob thiab cov kab hluav taws xob.
