According to the Graph Below,continental Crust Was Mostly Done Forming

question 34

Multiple Choice

According to the graph below,continental crust was mostly done forming by

• A) the mid-Archean.
• B) roughly 1 Ma.
• C) roughly 4.5 Ga.
• D) the early Proterozoic.

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Definitions:

Fold and Thrust Belt

A series of mountainous folds and thrust faults that develop near convergent tectonic plate boundaries, where one plate is forced over another.

Foreland Basin

A foreland basin is a structural depression that forms adjacent to a mountain range due to flexural subsidence, filling with sediments eroded from the associated orogeny (mountain-building process).

Back-Arc Rifting

A geological process in which the crust behind a volcanic arc stretches and thins, often leading to the formation of a new ocean basin.

Michigan Basin

A geological basin in the United States characterized by layers of sedimentary rock, indicative of its history as an ancient sea bed.