Glacial grooves and striations are gouged or scratched mus rau bedrock as the glacier move down stream. Pob zeb thiab pob zeb ntxhib tau daig hauv qab cov dej khov nab kuab, thiab ua rau thaj av tawg thaum lub glacier thawb thiab rub lawv mus.
Kev sib tw ua li cas?
Raws li cov dej khov ntws hla av, lawv muab cov pob zeb thiab cov pob zeb nkag mus rau hauv cov dej khov. … Sij hawm dhau mus, lub glacier txav hla pob zeb thiab sediment, tawm striations los yog striae, nyob rau hauv pob zeb nto uas yuav qhia tau hais tias lub glacier twb ntws.
Dab tsi yog qhov txhais ntawm striation hauv thaj chaw?
Nyob rau hauv geology, ib tug striation yog a groove, tsim los ntawm ib tug txheej txheem geological, nyob rau saum npoo ntawm pob zeb los yog ib tug ntxhia. … Qhov kev taw qhia stration qhia txog kev txav mus los hauv lub dav hlau txhaum. Cov kev sib tw zoo sib xws, hu ua glacial striations, tuaj yeem tshwm sim hauv cov cheeb tsam uas raug glaciation.
Vim cov cirques feem ntau pom nyob qhov twg?
Lawv tsim hauv lub tais zoo li kev nyuaj siab, tseem hu ua bedrock hollows lossis cirques, nyob ntawm sab, lossis ze roob. Lawv tus yam ntxwv tsim los ntawm kev sib sau ntawm cov daus thiab dej khov avalanching los ntawm qhov chaw upslope.
Glaciers nyob qhov twg?
Glaciers pib tsim nyob rau hauv qhov chaw uas muaj daus ntau ntxiv txhua xyoo dua li melts. Tsis ntev tom qab ntog, cov daus pib compress, los yog ua denser thiab nruj nreem ntim. Nws maj mam hloov ntawm lub teeb, fluffy crystals mus rau tawv,puag ncig ice pellets. Cov daus tshiab ntog thiab faus cov pob zeb no.
