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Continental Drift and Plate Tectonics Lesson
Presentation
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Science
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8th Grade
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Medium
+1
Standards-aligned
Mary Long
Used 84+ times
FREE Resource
9 Slides • 15 Questions
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Continental Drift Blind Quizizz
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Poll
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Poll
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Alfred Wegener
Proposed continental drift in 1915
Theorized a supercontinent, which he called Pangaea, began to break apart over 200 million years ago.
How it happened...he suggested the continents "plowed" through the crust.
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Multiple Choice
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Poll
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Wegener's Evidence
The continents fit together like a puzzle.
Fossils matched across oceans
Rock types and mountain ranges matched across oceans.
Coal deposits in Antarctica.
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Poll
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Open Ended
Take a look at this map of the world? What do you see?
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Evidence Wegener Didn't Have
American naval officer Harry Hess discovers mid-ocean ridges (undersea mountain ranges).
Sea Floor Spreading -- rock gets older farther away from the mid-ocean ridge; means new rock is forming at ridge.
Evidence of magnetic polarity reversals on both sides ?of the ridge (the geomagnetic reversal time scale)
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Geomagnetic Reversal Time Scale
New rock is forming at the mid-ocean ridge.
Rock farther from the ridge is older.
The colors on the graphic indicate magnetic polarity reversals on both sides of the ridge
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Multiple Choice
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Multiple Choice
How does rock that is closer to a mid-ocean ridge compare to sediment that is farther away?
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Multiple Choice
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How the continents move is something we will discuss tomorrow.
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Multiple Choice
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Multiple Choice
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Poll
Continental Drift Blind Quizizz
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