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The Earth and planetary sciences.

G W Wetherill, C L Drake

    Science (New York, N.Y.)
    |July 4, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Earth

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    Area of Science:

    • Earth Sciences
    • Geodynamics
    • Planetary Science

    Background:

    • The scientific consensus recognizes Earth as a dynamic system powered by internal heat.
    • Plate tectonics, characterized by the fragmentation and movement of Earth's outer shell, is a primary manifestation of this dynamism.
    • Convection within Earth's interior is the driving force, though its specifics and interior composition require further study.

    Purpose of the Study:

    • To explore the dynamic nature of Earth as a heat-driven engine.
    • To investigate the mechanisms and implications of plate tectonics.
    • To compare Earth's ongoing dynamism with the apparent long-term stability of other terrestrial planets.

    Main Methods:

    • Review of current understanding in Earth sciences regarding internal heat and dynamism.

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  • Analysis of surface geological evidence for continental drift and plate movement.
  • Comparative study of geological features on Earth and other terrestrial planets.

    • Main Results:

    • Earth exhibits continuous large-scale horizontal movement of crustal plates, driven by internal convection.
    • Evidence suggests other planets were once geologically active but now display stable surfaces.
    • Significant knowledge gaps remain regarding the precise nature of Earth's internal convection and composition.

    Conclusions:

    • Earth's internal heat drives a dynamic system of plate tectonics, unlike other observed terrestrial planets.
    • Continued research is essential to fully understand Earth's geodynamic processes and interior structure.
    • The unique dynamism of Earth has profound implications for its geology and potential for life.