Quaternary Period txhais li cas hauv thaj chaw?
Quaternary Period txhais li cas hauv thaj chaw?

Video: Quaternary Period txhais li cas hauv thaj chaw?

Video: Quaternary Period txhais li cas hauv thaj chaw?
Video: Mam saib koj ua neej # 2. 10/14/2017 2024, Kaum ib hlis
Anonim

Cov Lub Sijhawm Quaternary yog lub sijhawm geological lub sij hawm uas suav nrog 2.6 lab xyoo dhau los - suav nrog hnub tam sim no. Cov Lub Sijhawm Quaternary tau koom nrog kev hloov pauv huab cua, uas cuam tshuam rau cov khoom noj khoom haus thiab ua rau muaj kev ploj tuag ntawm ntau hom.

Hauv qhov no, qhov chaw zoo li cas hauv Quaternary Period?

Kev hloov pauv huab cua thiab kev txhim kho nws spurs nqa cov lus piav qhia ntawm Quaternary , 2.6 lab xyoo dhau los ntawm lub ntiaj teb keeb kwm. Glaciers nce los ntawm Ncej thiab tom qab ntawd thim rov qab, carving thiab molding av nrog txhua tus mem tes. Hiav txwv theem poob thiab nce nrog txhua lub sij hawm ntawm khov thiab thawing.

Cov nroj tsuag zoo li cas hauv Lub Sij Hawm Quaternary? Ntau cog thiab hom tsiaj nyob thaum lub sij hawm Lub Sijhawm Quaternary , nrog rau bushes, shrubs, prairie grasses, birch, ntoo thuv, spruce, Oak, maple thiab flowering nroj tsuag ntawm tag nrho hom . Qee tus tsiaj ntawd yog nyob rau lub sijhawm Quaternary : mammoth, mastodon, giant bison thiab woolly rhinoceros.

Ib yam li ntawd, tib neeg nug, Lub Sijhawm Quaternary ntev npaum li cas?

Cov Lub Sijhawm Quaternary tau muab faib ua ob lub sijhawm: Pleistocene (2.588 lab xyoo dhau los txog 11.7 txhiab xyoo dhau los) thiab Holocene (11.7 txhiab xyoo dhau los txog niaj hnub no). Lub sij hawm tsis raws cai "Late Quaternary " hais txog 0.5-1.0 lab xyoo dhau los.

Puas yog peb nyob hauv lub hnub nyoog dej khov?

Yam tsawg kawg yog tsib qhov loj dej khov muaj hnub nyoog tau tshwm sim thoob ntiaj teb keeb kwm: qhov ntxov tshaj plaws yog tshaj 2 billion xyoo dhau los, thiab qhov tshiab tshaj plaws tau pib kwv yees li 3 lab xyoo dhau los thiab tseem niaj hnub no (yog, peb nyob hauv ib dej khov muaj hnub nyoog !). Tam sim no, peb yog nyob rau hauv ib tug sov so interglacial uas pib txog 11,000 xyoo dhau los.

Pom zoo: