What type of silicate minerals is shown from this arrangement of silicon tetrahedron? 
A. double chains
B. sheets
C. frameworks
D. independent tetrahedra
E. single chains
Answer: C
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The most serious drawback to fuel cells is the expense of providing an oxygen source.
Answer the following statement true (T) or false (F)
Photosynthetic autotrophs changed the composition of the atmosphere during the oxygen revolution
a. True b. False
Passive solar technologies ________
A) use the energy of sunlight without relying on electrical or mechanical devices B) use mechanical devices to heat water and buildings or electrical devices to generate electricity C) use mirrors to concentrate the sun's rays on a tower or a series of pipes holding water D) use photovoltaic cells to produce light energy E) use silicon wafers to generate light energy
Which of the following is a capability of a geographic information system (GIS)?
a. data storage b. data manipulation and analysis c. map production with overlays of different information layers d. All of these