tirta dwi gustina.ppt
TRANSCRIPT
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Tirta Dwi Gustina
R1C1 15 093
English science percentage
Geological enginering
Halu oleo university
Kenari!015
The Theorical Of Continental Drift
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"egener
1##0$1930
eartho%servatory&nasa&gov
'l(re "egener (irstpropose the theory o(continental ri(t&
Continental driftwas Wegenerstheory that all continents hadonce been joined together in asingle landmass and have drifted
apart since. Wegener named this
supercontinent Pangaea. Wegeners theory was rejected
by scientists because he could
not explain what force pushes orpulls continents.
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Fit of ContinentsAcross the Atlantic
Mountain ranges in
South America line
up exactly with
those in Africa!
Notice how fossils lined up across continents!
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Discovery o( )ea$*loor )preaing
As the sea floor spreads, the lava cools according to the magnetic poles at the
time. The rocks on the ocean floor have proved that the earths magnetic field
sometimes reverses. The inner core flips and so the north pole moves to thesouthern hemisphere! The earthh itself does not flip.
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'ni+ation o( sea (loor spreaing
The place where two plates move apart or divergeis called a divergent boundary.
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This is a model of sea floor spreadingat a divergentboundarycalled
a mid ocean ridge.
A convergent boundaryis where twoplates come together, or converge. Theresult of the plates hitting together iscalled a collision.
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(ro+, http,--www&geo&lsa&u+ich&eu-.crl%-C/R)E
Continental crust to continental crust
collision
2nia$'sia Hi+alayas4
Before collision
After collision
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Thank you verymuch