Learning Objectives I can describe Alfred Wegener’s hypothesis of continental drift. I can explain how sea-floor spreading provides a way for continents.

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Presentation transcript:

Learning Objectives I can describe Alfred Wegener’s hypothesis of continental drift. I can explain how sea-floor spreading provides a way for continents to move. I can describe how new oceanic lithosphere forms at mid-ocean ridges. I can analyze how magnetic reversals provide evidence for sea-floor spreading.

Ch.4, Sec.2 - Restless Continents continental drift: the hypothesis by Alfred Wegener that states that the continents once formed a single landmass, broke up, and drifted to their present locations. - many fossils & rocks are found only on certain parts of certain continents.

Ch.4, Sec.2 - Restless Continents - the continents slowly drifted away from Pangaea, which was the super-continent that existed 245 million years ago. (same time as dinosaurs)

Ch.4, Sec.2 - Restless Continents sea-floor spreading: the process by which new oceanic lithosphere forms as magma rises toward the surface and solidifies.

Ch.4, Sec.2 - Restless Continents

Ch.4, Sec.2 - Restless Continents - the best evidence of sea-floor spreading comes from magnetic reversals recorded in the ocean floor. - iron in the newly formed rock at the mid-ocean ridges has a magnetic field that is slowly spreading across the sea floor & reversing the polarity. - intervals occur once every 200,000 years on average

Ch.4, Sec.2 - Restless Continents

Ch.4, Sec.2 - Restless Continents - geologists predict that the continents will continue to move into another supercontinent, called Pangaea Ultima, in 250 million years!

Ch.4, Sec.2 - Restless Continents

Ch.4, Sec.2 - Restless Continents

Exit Slip How do magnetic reversal fields at oceans’ floors prove that the sea-floor is spreading?