Glacial erosion entrains a boulder of the bedrock. … Raws li lub glacier retreats, lub pob zeb yog tso rau ntawm ib tug txawv hom ntawm bedrock, ua ib tug glacial erratic. Erratics tuaj yeem muaj los ntawm cov pob zeb loj mus rau cov pob zeb me thiab pebbles. Txhua yam tsis raug yog ntawm cov pob zeb sib txawv.
Yuav ua li cas glacial erratics tsim?
Y
Erratics yog tsim los ntawm glacial ice erosion tshwm sim los ntawm kev txav ntawm dej khov Glaciers erode los ntawm ntau yam txheej txheem: abrasion / scouring, plucking, ice thrusting thiab glacially-induced spalling. Glaciers tawg tej pob zeb tawm hauv cov txheej txheem ntawm plucking, ua qhov loj dua erratics.
Yuav ua li cas tsis raug tsim?
Glaciers tuaj yeem khaws cov pob zeb thiab thauj lawv mus debThaum lawv tso cov pob zeb no, lawv feem ntau nyob deb ntawm lawv lub hauv paus chiv keeb-cov qoob loo los yog cov pob zeb uas lawv tau plucked. Cov pob zeb no hu ua glacial erratics. Erratics sau zaj dab neeg ntawm lub glacier taug kev.
Yuav ua li cas yog glacial erratics thiab lawv tuaj qhov twg?
Glacial erratics yog pob zeb thiab pob zeb uas tau thauj los ntawm lub qhov dej khov, thiab tom qab ntawd tso tseg tom qab lub glacier melted. Erratics tuaj yeem nqa tau ntau pua mais, thiab tuaj yeem muaj qhov loj ntawm pebbles mus rau pob zeb loj.
Yuav ua li cas ua rau dej khov?
Glacial drift yog cov khoom siv sedimentary uas tau thauj los ntawm cov dej khov Nws suav nrog av nplaum, av nplaum, xuab zeb, pob zeb, thiab pob zeb. … Vim muaj kev hloov pauv hauv lub ntiaj teb kev nyab xeeb, nws qhov chaw nyob tau hloov pauv raws sijhawm ua rau cov txheej txheem yaig thiab tso tawm los ntawm cov dej khov.
