Stream erosion produces what type of valley shape?
a. V
b. U
c. S
d. W
a
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During permineralization, volatile elements are lost from organic matter, leaving a carbon film. Indicate whether the statement is true or false
Plate tectonics (continental drift):
A) is probably responsible for some climatic changes that occur on a time scale of thousands of years. B) may be a key factor in explaining the cooling trend since the 1940s. C) may help us better understand the cause of the Ice Age.
The most important source of income to many Native American groups is
A. agriculture B. manufacturing C. cultural tourism D. gambling casinos
Which of the following is most likely a major component of open-ocean sediments at depths shallower than the CCD?
A. Calcareous ooze B. Cosmogenous materials C. Lithogenous sediments D. Hydrogenous sediments E. Siliceous ooze