What is a main source of terrigenous sediments?

a. Volcanic eruptions
b. Rivers
c. Dust and ash
d. Cosmic dust


ANS: B
Terrigenous sediments are those derived from land. The erosion on land is carried down rivers to the
ocean. Information can be found in the section Sediments May be Classified by Source.

Environmental & Atmospheric Sciences

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Describe how the semivariance can be used to quantify the spatial dependence in a data set.

What will be an ideal response?

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Scientists can predict that earthquakes will occur in a certain area within a timeframe of

A) 3 to 6 months. B) 2 to 5 years. C) 30 to 100 years. D) 1 to 500 years.

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The worlds climatic regions determine to a large extent the location of the world's biomes

Indicate whether the statement is true or false

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Which metal would not be found in hydrothermal veins?

A. zinc B. lead C. silver D. gold E. aluminum

Environmental & Atmospheric Sciences