Kev nyab xeeb. Yardangi

2024 Tus sau: Seth Attwood | [email protected]. Kawg hloov kho: 2023-12-16 16:06

qib 124 hauv tsab xov xwm Gobi Suab puam. Tuam Tshoj pom cov khoom nthuav. Ntawm lawv yog geological - yardangs

Raws li txoj cai, cov no yog aeolian landforms uas tshwm sim nyob rau hauv lub zog ntawm cua, feem ntau nyob rau hauv cov cheeb tsam uas muaj arid huab cua (deserts, semi-deserts). Lawv nqaim, sib npaug, ncaj furrows nrog asymmetric steep slopes, elongated raws cov cua, thiab ntse ridges cais lawv, tsim nyob rau hauv cov suab puam nyob rau saum npoo ntawm av nplaum thiab loamy los yog denser pob zeb. Qhov siab ntawm yardangs ncav cuag ob peb meters. Yardangs kuj pom nyob rau hauv cov suab puam ntawm Central Asia. Lawv kuj pom nyob rau ntawm Tibesti toj siab thiab hauv Arizona ze ntawm Phoenix thiab Windou Rock. Yardangs txawm nyob rau Mars.

Yardangi sab hnub tuaj ntawm Gobi

Qhov no yog qhov chaw los ntawm saum toj no. Txuas rau daim ntawv qhia. Cua yaig zoo li tsis ua haujlwm. Nws zoo li kev ua haujlwm ntawm dej yaig, loj heev gullies. Qhov chaw zoo li qhov tawg ntawm dej. Sab laug thiab sab xis - roob toj siab

Oriented ridges

Nyob rau sab hnub poob, cov seem raug puas tsuaj heev uas tib yam li cov xuab zeb ridges tshwm los ntawm lawv. Txawm hais tias geologists hais tias cov no yog dunes tsim los ntawm cua. Tab sis qhov no tsis yog nyob rau lwm qhov chaw ntawm cov suab puam.

Ntawm qhov nkag mus rau thaj chaw no Tab sis yuav ua li cas kom paub meej tias nws yog dej yaig? Qhov no qhia tau hais tias muaj pebbles nyob rau hauv cov chaw no.

Tsaus pob zeb - pebble

Muaj yardangs cia li mus rau sab qab teb, uas yog qhia los ntawm sab hnub poob mus rau sab hnub tuaj. Thiab raws li koj tau pom, lawv tau hla mus rau sab hnub poob los ntawm dunes, uas yog tsim los ntawm cov cua uas nyob ntawm no. Los ntawm txoj kev, ntawm no koj tuaj yeem pom cov seem ntawm sab hnub poob ntawm Great Wall of China:

Tseem tshuav ntawm phab ntsa thiab lub nroog no. Tej zaum qhov no, ib yam nkaus, puas tsuaj los ntawm dej nyab?

Thiab pom cov pebbles ntawm ko taw ntawm cov seem ntawm phab ntsa

Kuj pebbles

Qhov seem ntawm phab ntsa yog ib lub mound ntawm pebble thiab av nplaum

Daim ntawv qhia txuas

Tib phab ntsa yog ntau rau sab hnub tuaj.

Cov Suav tab tom sim tiv thaiv ib yam dab tsi. Yuav kom khaws cov khoom ntawm phab ntsa? Doubtful xyov. Erosion yuav tsis tseg cov seem no lawm. Peb hla mus rau sab qaum teb. Ntawm no, ib yam nkaus, cov kab zoo sib xws ntawm kev nyem los ntawm dej ntws los ntawm sab qaum teb mus rau sab qab teb:

Txuas rau qhov chaw

Ua ntej, qhov sib sib zog nqus ridges nyob rau sab qaum teb ntawm thaj chaw no

Raws li koj tuaj yeem pom, cov no tsis yog dunes, tab sis qhov seem ntawm qhov chaw qub. Tsuas yog dej yaig tuaj yeem ntxuav tawm tag nrho cov pob zeb no thiab nqa mus ntxiv.

Raws li tau hais hauv wikipedia, muaj cov lus hais zoo sib xws ntawm cov dej ntws ntawm lwm lub teb chaws, cov suab puam. Tshwj xeeb hauv Africa, North America thiab Mars. Tej zaum qhov no hais txog qee cov txheej txheem ntawm kev puas tsuaj. Yog hais tias nyob rau Mars - qhov no yog kev sib tsoo nrog asteroids, ces nyob rau lub ntiaj teb nrog dab tsi? Tej zaum nrog ib tug loj comet? Gobi Desert nws tus kheej zoo ib yam li ib qho elongated funnel uas muaj dej los ntawm cov dej khov yaj. Thiab nyob ib ncig ntawm nws - Tibet, lub Himalayas - ib tug kab ntawm tectonic hloov, slowing down ntawm lithosphere.