The main purpose of the Three Gorges Dam on the Yangtze River is to ____________.
Fill in the blank(s) with the appropriate word(s).
all of these
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Imagine you fly a direct route from northern Greenland to the southern part of Hudson Bay. The correct sequence of climate types you would pass would be
A) Dfc, ET, E. B) Dfc, E, ET. C) ET, E, Dfc. D) EF, ET, Dfc.
Although the last major ice sheets receded 10,000 years ago, there exists pollen and tree ring data
to indicate that since 6,000 years ago there have been small glacial advances and retreats. Indicate whether the statement is true or false.
What type of cleavage would be exhibited by a mineral that has this arrangement of silicon tetrahedron? 
A. one direction of cleavage B. the mineral fractures instead of cleaves C. two nonperpendicular directions of cleavage D. two perpendicular directions of cleavage
Volcanic ash ____
a. ?is so small that it does no damage if inhaled b. ?is carried so high into the atmosphere that it does not have much effect on the area near an eruption c. ?has a large effect near an eruption, but little effect further away d. ?is composed of aerosols formed from the reaction of gasses and water vapor e. ?is a major disruption to transportation and evacuation