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📘 How does a continent drift?

A continent is not a loose raft sliding through the mantle. It is thick continental crust carried by a larger tectonic plate, which also includes oceanic crust and rigid upper mantle. Beneath the plate, the asthenosphere can deform slowly o

5
lessons
~25 min
to learn
Adults
level
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What you’ll learn

  1. A continent is a passengerUse fossils, rocks, shelves, and paleoclimate clues to explain why continents have moved.Continents are carried inside larger plates, and several independent historical clues fit past reconstructions.
  2. The ocean floor records the moveExplain how ridges, magnetic stripes, crustal ages, and trenches record seafloor spreading and recycling.New ocean crust forms at ridges, records magnetic reversals, moves outward, and is recycled at trenches.
  3. Motion happens at boundariesDistinguish divergent, convergent, and transform boundaries by their motions and evidence.Plate boundaries organize the ridges, trenches, faults, earthquakes, and volcanoes that reveal motion.
  4. We can measure the driftInterpret modern GPS velocities and compare present rates with geological averages.GPS measures tiny present-day movements, while magnetic stripes and matched rocks average motion over longer times.
  5. Drift changes the planetConnect continental motion to rifting, mountain building, climate geography, and a chain of evidence.Slow plate motion rearranges oceans and continents, builds mountains, and leaves a converging evidence trail.

Questions this course answers

What does a continent move as part of?

Continental crust is carried within a lithospheric plate.

Match each clue to what it records.

Different clues preserve different parts of a continental reconstruction.

Why are magnetic stripes symmetric around a mid-ocean ridge?

Successive magnetic reversals are recorded as new crust spreads outward in both directions.

Put the seafloor process in order.

Spreading creates crust, transports it, and eventually recycles it at a trench.

Which boundary mainly slides plates sideways?

Transform boundaries accommodate mostly sideways relative motion.

Match each boundary with its typical feature.

Boundary motion leaves characteristic landforms and earthquake patterns.

Grounded in trusted sources

  • U.S. Geological Survey, How fast do tectonic plates move?, https://www.usgs.gov/faqs/how-fast-do-tectonic-plates-move
  • U.S. Geological Survey, This Dynamic Earth: Understanding plate motions, https://pubs.usgs.gov/gip/dynamic/understanding.html
  • U.S. Geological Survey, This Dynamic Earth: The story of plate tectonics, https://pubs.usgs.gov/gip/dynamic/dynamic.html
  • National Park Service, Plate Tectonics - The Unifying Theory of Geology, https://www.nps.gov/subjects/geology/plate-tectonics-the-unifying-theory-of-geology.htm
  • National Park Service, Rock Magnetics Laboratory, https://home.nps.gov/subjects/nationalhistoriclandmarks/rock-magnetics-laboratory.htm
  • U.S. Geological Survey, Introduction to Subduction Zones, https://www.usgs.gov/special-topics/subduction-zone-science/science/introduction-subduction-zones-amazing-events
  • Wikimedia Commons MediaWiki API, image metadata and thumbnails, https://commons.wikimedia.org/w/api.php

Every Wunder lesson is built from real, reputable sources — never invented.

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