Lub ntiaj teb lub crust feem ntau muab faib ua cov laus, thicker continental crust thiab yau, denser oceanic crust. Lub dynamic geology ntawm lub ntiaj teb crust yog qhia los ntawm phaj tectonics.
hom crust twg yog tuab dua?
Continental crust feem ntau yog 40 km (25 mais) tuab, thaum dej hiav txwv crust yog thinner, qhov nruab nrab ntawm 6 km (4 mais) hauv tuab. Cov nyhuv ntawm qhov sib txawv ntawm cov pob zeb lithospheric tuaj yeem pom nyob rau hauv qhov sib txawv nruab nrab qhov siab ntawm continental thiab dej hiav txwv crust.
Lub ntiaj teb lub pob zeb twg yog qhov tuab tshaj?
Cov pob zeb yog tuab tshaj plaws hauv qab roob siab thiab thinnest hauv qab dej hiav txwv. Lub continental crust muaj pob zeb xws li granite, sandstone, thiab marble. Lub oceanic crust muaj bas alt.
Vim li cas lub teb chaws pob zeb yog thicker?
Cov pob zeb sab av loj kuj tsawg dua li dej hiav txwv crust, txawm hais tias nws yog qhov hnyav dua… mantle (piv txwv li, qhov twg continental crustal blocks sib tsoo thiab dhau thicken, ua rau sib sib zog nqus melting).
Dab tsi ua kom tuab tuab dua li cov crust?
Continental crust tseem tsawg dua qhov ntom ntom ntawm dej hiav txwv crust, nws qhov ceev yog li 2.9 g / cm3 Ntawm 25 txog 70 km, continental crust yog considerably thicker tshaj dej hiav txwv crust, uas muaj ib tug nruab nrab thickness ntawm ib ncig ntawm 7-10 km. Kwv yees li 40% ntawm lub ntiaj teb saum npoo av thiab li ntawm 70% ntawm qhov ntim ntawm lub ntiaj teb crust yog continental crust.
