In the northern hemisphere, a solar panel should be placed on the side of the roof facing
a. east.
b. west.
c. north.
d. south.
e. any of these directions.
ANSWER: d
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The most efficient and long-lasting light bulb available today is the LED (light-emitting diode)
Indicate whether the statement is true or false
Which of the following is an example of the nonconsumptive use of water?
A) River navigation B) Hydroelectric power production C) Municipal treatment of wastewater D) Water consumption by humans and livestock
From this cross section of the Grand Canyon, what is the boundary between the various Precambrian rocks and the Paleozoic sedimentary units?
A) It is a depositional contact, probably representing only a short period of geologic time.
B) It is an angular unconformity in most places and a nonconformity where it overlies granite.
C) It generally is an unconformity and represents more time in the right part of the diagram than in the left part of the diagram.
D) All of these are correct.
Both sphenopsids and lycopsids were important members of the Pennsylvanian forests. Indicate whether the statement is true or false