Define mariculture, and describe the fish typically grown commercially. What will be an ideal response?
Maricultureis the farming of marine organisms, usually in estuaries, bays, or nearshore
environments or in specially designed structures using circulated seawater. Mariculture
facilities are sometimes placed near power plants to take advantage of the warm seawater
flowing from their cooling condensers. Worldwide mariculture production is thought to be
about one-eighth that of freshwater aquaculture. Several species of fish, including plaice and
salmon, have been grown commercially, and marine and brackish-water fish account for twothirds
of the total production. Shrimp mariculture is the fastest-growing and most profitable
segment, accounting for about 15% of the total international trade in fish products in 2011.
The value of the white-leg shrimp alone was estimated at more than US$12 billion that same
year. In the United States, annual revenue from mariculture now exceeds US$210 million,
with most of the revenue generated from salmon, kampichi (a tuna), and oyster mariculture.
More than half of the oysters consumed in North America are cultured.
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According to the concentric zone model, a city develops in a series of
A) corridors. B) nodes. C) rings. D) sectors. E) quadrants.
Volcanoes and earthquakes
A. have few areas of overlap in their distributions on Earth. B. have many areas of overlap in their distributions on Earth. C. have no areas of overlap in their distributions on Earth.
Atmospheric gas:
A) will, for a given amount of gas, experience an increase in pressure if the volume of the gas is decreased. B) undergoes abrupt pressure changes as height above the surface of the earth increases. C) has a smaller mean free path at higher elevations than at lower elevations. D) has no significant effect on sports events played at different elevations.
Which of the following events may have contributed the most to the decline of fertility rates in the United States after 1963?
A) The Vietnam war B) Improved methods of family planning C) The Civil Rights movement D) The lowering of the voting age to 18 years old in 1971