Consider the following statement: A good aluminum ore deposit is defined at this time as one that
contains about 35% aluminum. What is the significance of the words "at this time" in this statement? Indicate whether the statement is true or false.
Ore is a metallic reserve. This means that it must be economically exploitable. The factors controlling
the economics of mining a given substance are not constant. Something that is economically
exploitable at one time may not be at a later time and vice versa.
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Which of the following is true about how coasts are affected from the water side?
A) Most waves are generated by earthquakes and become larger upon approaching the shore. B) Most erosion along shorelines occurs from offshore currents. C) Waves can erode, deposit, or simply transport sediment. D) Tides increase and decrease the size of waves but leave sea level unchanged. E) None of these are correct.
The external equivalent of stress is:
a. strain b. load c. pressure d. deformation
As a result of the Coriolis effect in the northern hemisphere, winds always are deflected ________
A) at a 45° angle from their original direction B) at a 90° angle from their original direction C) to the east of their original direction D) to the left of their original direction E) to the right of their original direction
The most important pull factor for migrants to North America today is
A) economic. B) environmental. C) forced. D) political. E) geomagnetic.