tirta dwi gustina.ppt

7/26/2019 TIRTA DWI GUSTINA.ppt

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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

tirta dwi gustina.ppt

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