What type of subsistence agriculture depends on the seasonal movement of livestock for their livelihood?
A) pastoralism
B) pastoral nomadism
C) plantation agriculture
D) shifting cultivation
E) slash-and-burn
B
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In order to increase the thermal resistance of a typical exterior frame wall, it is customary today to use 2 × 6 studs instead of 2 × 4 studs to allow for the placement of more insulation within the wall cavity. A typical exterior (2 × 6) frame wall of a house consists of the materials shown in Figure P5.13. Assume an inside room temperature of 68oF, an outside air temperature of 20oF, and an exposed area of 150 ft2 . Determine the heat loss through this wall.
The formation of acetone from acetoacetate is an example of which of the following type of reaction?
A) decarboxylation B) hydrolysis C) reduction D) oxidation
What best describes the difference between solar thermal and photovoltaic systems?
A. solar thermal operates only during the daytime B. photovoltaic generates electricity only C. solar thermal works better in warm climates D. photovoltaic use electricity and can operate at night E. photovoltaic generates both heat and electricity
Where are coral reefs almost entirely found?
A. equatorial islands B. on west coasts C. between the tropics D. on east coasts E. volcanic islands