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

question 46

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) Opening of the North Atlantic Ocean converted lithosphere to asthenosphere beneath eastern North America, forcing eastern North America to sink to low elevations.
• D) The mountains cooled following the collision, which increased the density of the of the rocks by cooling, and isostasy forced the mountains to sink.

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Definitions:

Metabolic Rate

The rate at which the body expends energy or burns calories.

Thin Person

An individual whose body shape is characterized by low amounts of body fat and lean muscle, often naturally or through lifestyle.

Large Person

A descriptive term that generally refers to an individual of greater than average body size or mass.

Indirect Calorimetry

A method to measure energy expenditure by assessing oxygen consumption and carbon dioxide production.