Chapter 12-1

Continental Drift

Chapter

12-1

Pan-gaea “all - earth”

Pangea Grade 3.url

Note: Our world today is actually a 2’nd or 3’rd generation “super continent” or “pangea” !!!

Alfred Wegener “Continental Drift Theory”

Bumper Sticker!

How many words do you know?

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Paleo-glaciation! Refers to the study of Old Glaciers

More Climatic Evidence of Continental Drift……

Found in Africa!!!

These glacial scrapings are found in AFRICA !!!

Continents are still moving today!

http://www.youtube.com/watch?v=Hf74Sp0Xe6Q

Alternate theory of Continental Drift

Wegener’s idea of continental drift (1930) was rejected….

People said…if “continental drift” is true…..explain how it occurs! Where is the proof ????

Unfortunately…..

Give me the proof!

Harry Hess (American)…. 1950’s …Makes a Startling Discovery…

http://www.youtube.com/watch?v=sruSoUoZAUg&feature=related

Its called …...

“Sea Floor Spreading”

This is called “Sea Floor Spreading”

Evidence of Sea Floor Spreading is called “Magnetic Reversal”

http://www.youtube.com/watch?v=t-ctk4KR-KU&feature=related

Sea Floor Spreading – Review

Africa is Splitting Apart!!!

Paleomagnetism and Sea Floor Spreading explains continental drift! (and why ….. A) why fossils on both sides of the ocean are the same B) why mountain ranges on both sides of the ocean are the same C) why rocks are the same on both sides of the ocean D) why coal is found in the Antarctic E) why paleoglaciation explained rock scrapings in Africa

Continental Drift!!!! --- The slow movement of continental plates caused by sea floor

spreading over hot, rising magma (liquid rock)

Canadian Tuzo Wilson Puts it all together ! He explains how continental drift occurs! (1965)

Hawaiian Islands ….formed by

Hot Spots !!

Summary