The Appalachian Mountains May Have Once Been as Lofty as the Himalayan-Tibetan

question 95

Multiple Choice

The Appalachian Mountains may have once been as lofty as the Himalayan-Tibetan Mountain belt is today.Why are they not this high now?

• A)They developed a dense crustal root following collision,and isostasy forced them to sink to their present elevation.
• B)They formed long ago,and erosion has beveled them to their present low elevation.
• C)The mountains cooled following the collision,which increased the density of the of the rocks by cooling,and isostasy forced the mountains to sink.
• D)Opening of the North Atlantic Ocean converted lithosphere to asthenosphere beneath eastern North America,forcing eastern North America to sink to low elevations.

---

Definitions:

Promissory Estoppel

A legal principle that prevents a party from withdrawing a promise made to another party if the latter has reasonably relied on that promise to their detriment.

Traditional Contract

A legally binding agreement following established legal formats and norms, typically involving a written document.

Unilateral

Involving only one party or side, often referring to actions or agreements made by one entity without the need for consent or participation of another.

Frequent Buyer

An individual or entity that consistently purchases goods or services from a particular company, often benefiting from loyalty programs.