CCSS 1º ESO Unidade 2 O relevo
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Unidade 2O relevo
David Barrán Ferreiro1º ESO CCSS
CPR Calasancias A Coruña
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A orixe do relevo
Forzas internas da
terra (movementos)
Materiais (rochas)
Forzas externas (erosión)
O relevo do planeta
(accidentes xeográficos
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Historia da terra
Formouse fai 4550 millóns de
anos
As etapas da terra son “Eras
Xeolóxicas”
A teoría da deriva continental de
Wegener
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• Formación da terra fai 4550 millóns de anos• Aparecen os primeiros invertebrados.
Era arcaica (4550m-570m a. C.)
• Formouse a Panxea, sobre a que había grandes cordilleiras
Era primaria (570m-250m a. C.)
• Fragmentouse a Panxea• Período de erosión• Aparecen os dinosaurios
Era secundaria (250m-65m a.C.)
• Os continentes continuaron dividíndose• Fórmanse as cordilleiras do Himalaia, Alpes e os
Andes• Os mamiferos habitan o planeta
Era terciaria (65m-2,6m a.C.)
• Período de erosión: xeo, vento e auga. Modelouse o relevo actual
• Deuse a evolución humana
Era cuaternaria (2,6m a.C-actualidade)
Historia da terra: Eras Xeolóxicas
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A estrutura interna da terra
Codia: continental e oceánicaManto
Núcleo
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Litosfera Dividida en placas
Móvense sobre a
astenosfera (deriva
continental)
Formando o relevo
A estrutura interna da terra
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As forzas internas de formación do relevo
Movemento das placas tectónicas
DobramentosFractura
Importan os materiais (rochas)
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As forzas externas da formación do relevo
Erosión
Meteorización
TransporteSedimentación
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Auga
Vento
Xeo e temperaturas
Home
As forzas externas da formación do relevo
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