Definition

1. Noun:
   • A state of equilibrium in geology: "Isostasy" refers to the theoretical balance or equilibrium of large sections of the Earth's lithosphere as if they were floating on the denser, underlying asthenosphere. It describes the gravitational equilibrium between the Earth's crust and mantle, where the elevation of the crust is determined by its thickness and density.

Usage Examples

• Noun:
  • The concept of isostasy explains why mountains have deep roots.
  • Glacial rebound is a classic example of isostasy in action.
  • Scientists study isostasy to understand changes in land elevation over geologic time.

Advanced Usage

• "Principle of isostasy": The fundamental theory describing the state of gravitational equilibrium.
  • The principle of isostasy is crucial for interpreting gravity anomalies.
• "Isostatic adjustment" or "isostatic rebound": The process of returning to equilibrium after a load (like ice) is added or removed.
  • The land is slowly rising due to post-glacial isostatic rebound.

Variants and Related Words

• Isostatic (adj): Relating to or characterized by isostasy.
  • The region is undergoing isostatic uplift.
• Isostatically (adv): In an isostatic manner.
  • The crust responds isostatically to erosion.

Synonyms

• Gravitational equilibrium (in a geological context).
• Buoyant equilibrium (specifically for the lithosphere).

Related Concepts (Not Phrasal Verbs or Idioms)

• Compensation (in isostasy): The idea that mass deficiencies (like ocean basins) are compensated by mass excesses (like mountains) at depth.
• Airy isostasy and Pratt isostasy: Two different models explaining the mechanism of isostatic balance.

Noun

1. (geology) a general equilibrium of the forces tending to elevate or depress the earth's crust