Why do dunes form? How are they self-generating? What will be an ideal response?
Dunes form when wind flows over and around an obstruction, resulting in the deposition of sand
grains, which accumulate and build up a deposit of sand. As they grow, they form ever-larger wind
barriers that further reduce the wind's velocity, resulting in more sand deposition and growth of the
dune.
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Guano, the excrement of seabirds, can accumulate into phosphate-rich rocks of commercial value. This island nation had an economy entirely based on the mining of phosphate deposits.
A. Nauru B. Bougainville C. Pitcairn D. Ruapehu
The term "________" refers to a group of elements called lanthanides and actinides that are not often found in large, commercially valuable quantities
A) special earths B) restricted minerals C) rare earths D) earth obscures E) nonelastic minerals
Which of the following was NOT among the five largest world cities in 2013?
A) New York City B) Seoul C) Tokyo D) Shanghai
Salinization is likely to occur in
A) the tundra regions. B) the tropics. C) areas of high potential evapotranspiration rates. D) humid climate regions. E) areas characterized by coniferous forests.