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Samenvatting Havo 4/5 - H1 Systeem Aarde - De Geo

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Bevat informatie van H1 Systeem Aarde Opbouw van de aarde, endogene processen, ontstaan van continenten en meer.

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Aardrijkskunde – H1 Systeem Aarde
Renashae Ugueto
Paragraaf 1
Geologische tijdschaal
Definitie
 Indeling van de 4.6 miljard jaren omvattende geologische geschiedenis van de
aarde.


Relatieve tijdschaal
Definitie
 De volgorde van de tijdperken was bekend, maar niet in het aantal jaren.
Bepalen dmv sedimentlagen.
 Onderste sediment = oudst.


Absolute ouderdomsbepaling
Definitie
 Jaartallen koppelen aan de tijdschaal.
Bepalen dmv radioactieve verval van gesteenten.


Opbouw van de aarde
Indeling
 Chemische eigenschappen
Aardkern, -mantel, en -korst.
 Fysische eigenschappen
Lithosfeer en asthenosfeer.


Aardkern
Mengsel van nikkel en ijzer.
Binnenste gedeelte = vast gesteente
Buitenste gedeelte = +- vloeibaar gesteente

, Aardmantel
Bevatten veel ijzer en magnesium.
Binnenmantel = gedraagt als vast gesteente
Buitenmantel = taai-vloeibaar/plastisch, behalve laatste 40 km.


Aardkorst
Grotendeels verbindingen van zuurstof met ijzer, calcium, magnesium, natrium en
aluminium.
Dikte
 Oceanische korst = 7-10 km
 Continentale korst = 35-40 km


Lithosfeer
Definitie
 Buitenste schil van de aarde.
Bestaat uit
 Aardkorst
Continentale en oceanische korst.
 Aardmantel
Buitenste, vast gesteente
Dikte = 100-150 km


Graniet
Definitie
 Stollingsgesteente (H2 §1) met zichtbare kristallen.
Ontstaan = langzame afkoeling van magma.
Continentale korst
Soortelijke massa = 2.8

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