What is the Convectional current theory?

By Ritesh|Updated : September 5th, 2022

Arthur Holmes presented the Convectional Current Theory in the 1930s, discussing the likelihood that the mantle region would experience convection currents. Due to radioactive materials altering the mantle's temperature gradient, these currents are produced.

  • Holmes asserted that the entire mantle portion contains a system of these currents.
  • It was an attempt to offer an answer to the force problem, which led modern scientists to reject the notion of continental drift.

Convectional Current Theory (1930) by Arthur Holmes

  • Arthur Holmes put forth the Convectional Current Theory in the 1930s.
  • The core of the seafloor spreading theory is the current convection theory.
  • This theory states that the intense heat produced by radioactive substances in the mantle, located between 100 and 2900 kilometers beneath the planet's surface, searches for a means to escape and induces convection currents to form.
  • Convection currents move through the liquid asthenosphere beneath the solid lithosphere.
  • Seas and oceans are created when divergent convective currents force crustal blocks apart in opposing directions.
  • Examples include the lake system in East Africa, the Mid-Atlantic Ridges, and others.
  • Convergent convective currents cause subsidence in the crustal zones, which causes sea closure and geosynclines, which lead to the formation of mountain ranges, island arcs, and other features.

Summary:

What is the Convectional current theory?

In the 1930s, Arthur Holmes introduced the Convectional Current Theory, which discussed the probability that convection currents would occur in the mantle region. These currents are caused by radioactive elements changing the temperature gradient in the mantle. Holmes said that a network of these currents permeates the entire mantle portion.

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