Definition

Noun: - The scientific theory explaining the large-scale motion of Earth's lithosphere: Plate tectonic theory describes how Earth's outer shell is divided into several plates that glide over the mantle, causing continental drift, earthquakes, volcanoes, and mountain formation.

Usage

• As a subject of study: Plate tectonic theory is fundamental to understanding Earth's geological history.
  • Modern geology is built upon the principles of plate tectonic theory.
• As an explanatory framework: The theory is used to explain specific geological phenomena.
  • The formation of the Himalayas is perfectly explained by plate tectonic theory.

Advanced Usage

• In academic discourse: Often discussed in relation to evidence like seafloor spreading and paleomagnetism.
  • The conference focused on new geophysical data supporting plate tectonic theory.
• Historical context: Refers to the development and acceptance of the theory in the mid-20th century.
  • The acceptance of plate tectonic theory revolutionized the earth sciences.

Variants and Related Words

• Plate tectonics (n): Often used synonymously with "plate tectonic theory" to refer to the overall process and study.
  • The course is an introduction to plate tectonics.
• Tectonic plate (n): One of the individual rigid segments of the lithosphere.
  • The Pacific Plate is the largest tectonic plate.

Synonyms

• Tectonics: The study of the Earth's structural features, often encompassing plate tectonic theory.
• Global tectonics: A term emphasizing the worldwide scale of the processes described by the theory.

Related Phrases

• Theory of plate tectonics: A fuller, alternative name for the same concept.
  • The textbook chapter is titled "The Theory of Plate Tectonics".

Noun

1. the branch of geology studying the folding and faulting of the earth's crust