Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The branch of dynamics that is concerned with the causes and effects of forces and motions involving the earth's interior, including rotation, plate tectonics, volcanic eruptions, and seismic modeling.
  • noun The forces and motions involving the earth's interior.

from The Century Dictionary.

  • noun The study of the dynamics and physics of the processes and phenomena attending the gradual evolution of the earth and the changes that are still going on.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun the branch of geophysics that studies the deformation processes of planetary mantle and crust, and the resulting earthquakes and volcanism

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