A friend tells you that the crust and lithosphere under the Andes is thicker than the rest of the South American plate. Is your friend right that the plate is thicker under the mountains? Explain how you came to your answer

What principle might you use to help your explanation?
What will be an ideal response?


Your friend is correct that the crust is thicker under the Andes than the rest of South America. Since the mountains are tall, they must have a thick root in order to float on the mantle above the rest of South America. This is the principal of isostasy.

Environmental & Atmospheric Sciences

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A) Potential evapotranspiration B) Potential evaporation C) Actual evapotranspiration D) Actual evaporation E) Desired evaporation

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Judge the following sentence according to the criteria given below: Ocean waves are not considered body waves BECAUSE they transmit energy through the upper part of the ocean near the interface between the atmosphere and the ocean

A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.

Environmental & Atmospheric Sciences

Use the soil texture triangle to name the following by its correct texture class (named on Figure 28.2):



a) 17% sand, 28% silt, 55% clay:
b) 31% sand, 55% silt, 14% clay:

Environmental & Atmospheric Sciences

Although countries and regions are positioned all along the income continuum, most are clustered at the lower end of the scale

Indicate whether the statement is true or false

Environmental & Atmospheric Sciences