Drumlins feem ntau yog tsim los ntawm glacial sediments, txawm hais tias qee qhov qauv muaj pob zeb tseem ceeb (Menzies, 1979; Patterson thiab Hooke, 1995).
Yuav ua li cas cov sediments ua rau drumlins?
Drumlin tsim
Ib txhia muaj pob zeb cores nyob ib puag ncig los ntawm ib qho kev sib koom ua ke mus txog, tab sis lawv feem ntau tau ntim nrog tsis sib xyaw cov sediments uas tsis zoo, thiab yuav muaj. silts, xuab zeb, gravel thiab pob zeb. Txawm li cas los xij, lawv kuj tseem tuaj yeem pom nrog cov kab nrib pleb ntawm lawv qhov tseem ceeb lossis hauv txoj hauj lwm lee-sab.
hom av twg yog drumlins?
Drumlins yog elongated, teardrop-puab toj ntawm pob zeb, xuab zeb, thiab pob zeb uas tsim nyob rau hauv cov dej khov dej khov. Lawv tuaj yeem ncav cuag 2 mais (1.25 mais) ntev.
Drumlins txheej?
Drumlins yuav suav nrog txheej av nplaum, silt, xuab zeb, pob zeb thiab pob zeb hauv ntau qhov sib npaug; Tej zaum qhia tau hais tias cov khoom tau rov ntxiv rau hauv ib qho tseem ceeb, uas tej zaum yuav yog pob zeb lossis glacial mus txog.
Vim li cas drumlins muaj txiaj ntsig?
Kev sib txuas ntawm drumlins thiab cov dej khov nrawm nrawm yog tseem ceeb rau kev tshawb fawb huab cua. Thaum ua qauv kev hloov pauv huab cua, peb yuav tsum paub tias qhov dej khov loj npaum li cas thiab qhov txias npaum li cas thiaj li yuav nkag siab txog Hnub Nyoog Dej khov kawg. Lub glacier uas txav mus sai yuav tsis tuab li.
