Definition

1. Noun:
   • A rigid segment of the Earth's lithosphere: A "crustal plate" is one of the large, solid, and relatively rigid pieces that make up the Earth's outermost shell (the lithosphere). These plates are believed to move slowly over the underlying, more fluid asthenosphere.

Usage

• Noun:
  • The movement of crustal plates is responsible for earthquakes and volcanic activity.
  • Scientists study the boundaries where crustal plates meet.

Advanced Usage

• "Plate tectonics": The scientific theory that describes the large-scale motion of the Earth's crustal plates.
  • The theory of plate tectonics explains how crustal plates have shaped the continents over millions of years.

Variants and Related Words

• Tectonic plate (n): A synonym for "crustal plate," often used interchangeably in geology.
  • The Pacific Plate is a major tectonic plate.
• Lithospheric plate (n): Another technical synonym emphasizing the plate is part of the lithosphere.

Synonyms

• Tectonic plate
• Lithospheric plate

Related Phrases

• Plate boundary: The location where two crustal plates meet.
  • There are three main types of plate boundaries: convergent, divergent, and transform.

Noun

1. a rigid layer of the Earth's crust that is believed to drift slowly