What powers a Slocum glider?
a. Batteries
b. Photovoltaics
c. Currents
d. Gravitational energy, buoyancy, and heat
ANS: D
Slocum gliders are able to move up and down through a water column. It is powered by gravity and
buoyancy. A heat powered engine pumps the water over the ballast of the glider. Information can be
found in the section Studying Currents.
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International labor migration tends to originate in
A) rich countries with weak economies. B) poor countries with weak economies. C) rich countries with strong economies. D) poor countries with strong economies.
A saline, temporary lake in a desert is known as a(n) ____________________ lake
Fill in the blank(s) with correct word
The sludge that is a by-product of municipal sewage treatment
A. is volumetrically an insignificant problem. B. is sufficiently purified and harmless that it can safely be dumped anywhere. C. may be used as fertilizer, provided that it contains sufficiently low concentrations of toxic chemicals. D. is entirely useless solid waste requiring planned disposal.
Sinkholes and caverns can be produced by
A. The loss of plant roots in the soil B. Plant growth and soil acidity C. Mechanical weathering D. Abrasion E. Chemical weathering