unidade 6. a historia da terra
TRANSCRIPT
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1. A orixe do Sistema Solar e do noso planeta.
2. O tempo xeolóxico.3. Datación.
4. A historia da Terra.5. As extincións masivas.
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• 4560 m.a. nebulosa nun brazo da Vía Láctea.• Contráese.
• Aplánase e comeza a xirar.• Núcleo do disco xiratorio: FUSIÓN NUCLEAR: SOL
• Arredor: planetesimais.• Choques dos planetesimais: asteroides,
meteoroides, satélites e planetas.
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EvolucióEvolución do n do noso noso
planetaplaneta
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A CALOR INTERNA DA A CALOR INTERNA DA TERRA.TERRA.
• Gradente xeotérmico: incremento gradual da temperatura do interior terrestre conforme aumenta a profundidade.
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Mide o tempo real
no que transcorreu un suceso.
Compara aconteceme
ntos para ver cal é
máis antigo.
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Principais métodos radiométricosPrincipais métodos radiométricos
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Escudos ou cratóns máis antigos. Escudos ou cratóns máis antigos. Forman os núcleos de varios Forman os núcleos de varios
continentes actuáis.continentes actuáis.
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Rodinia
Pannotia
Panxea
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ArqueociátiArqueociátidosdos
GraptoliGraptolitestes
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TrilobiTrilobites tes
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Rana Rana pueyoipueyoi
CalceolCalceolaa
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Pteridófitas:Pteridófitas:AlethopterisAlethopteris
Pteridófitas:Pteridófitas:LepidodendronLepidodendron
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Triásico: Triásico: apertura apertura
do mar de do mar de Tetis.Tetis.
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Xurásico: Xurásico: apertura do apertura do
océano océano Atlántico.Atlántico.
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Cretáceo: Cretáceo: apertura do apertura do
océano océano Atlántico.Atlántico.
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AmonitAmonitasas
BelemnitBelemnitasas
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ArchaeopteArchaeopteryxryx
Réptil Réptil terápsidoterápsido
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NumuliNumulitastas
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Cráter de Chicxulub, Cráter de Chicxulub, norte de Yucatán norte de Yucatán
(México)(México)
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