Seafloor spreading

This episode, "Seafloor Spreading," explores the crucial process that drives plate tectonics and provides a mechanism for continental drift. Building upon our understanding of plate tectonics and continental drift, we delve into the discovery and evidence for seafloor spreading. We'll examine the features of mid-ocean ridges, the role of magnetic anomalies, and how new oceanic crust is continuously created. This episode will connect the seemingly disparate observations of continental drift and a dynamic Earth, demonstrating how seafloor spreading acts as the engine of plate movement.

Check your understanding

These are the same multiple-choice questions you will see in the Quiz section after you listen to the episode. Use them here to preview or review the answers.

What feature of the ocean floor was crucial in the development of the seafloor spreading hypothesis?

  1. Deep-ocean trenches.
  2. Continental shelves.
  3. Mid-ocean ridges.
  4. Abyssal plains.
  5. Seamounts.

Who proposed the concept of seafloor spreading?

  1. Alfred Wegener.
  2. Charles Darwin.
  3. Harry Hess.
  4. Isaac Newton.
  5. Marie Curie.

What is the process by which new oceanic crust is formed at mid-ocean ridges?

  1. Subduction.
  2. Seafloor spreading.
  3. Continental drift.
  4. Transform faulting.
  5. Orogeny

What provides strong evidence for seafloor spreading?

  1. The fit of the continents.
  2. Matching fossil distributions.
  3. Magnetic anomalies on the seafloor.
  4. The presence of mountain ranges on land.
  5. The distribution of earthquakes

How does seafloor spreading relate to continental drift?

  1. Seafloor spreading provides the mechanism for continental drift.
  2. Continental drift causes seafloor spreading.
  3. They are unrelated concepts.
  4. Seafloor spreading only occurs in the Atlantic Ocean.
  5. Continental drift only occurs on land.

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