Your friend shows you a purple-colored mineral sample he recently found while walking the beach. He claims that it must be quartz, because the color matches that of another quartz sample he saw in a museum. Do you think his identification is accurate?
A. Yes; the mineral quartz is almost always the color purple.
B. Maybe; further tests must be done to positively identify the mineral, since quartz can come in many different colors.
C. No; the mineral quartz is never purple.
Answer: B
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Considering the vertical dimension, which of the following describes the direction of the pressure gradient force (PGF), and the gravitational force?
A. Both forces are directed away from the Earth. B. Both forces are directed toward the Earth. C. The PGF is directed away from the Earth and the gravitational force toward the Earth. D. The PGF is directed toward the Earth and the gravitational force away from the Earth.
Volcanic domes commonly are partially destroyed when
A) gases are released slowly out the top of the dome, dissolving it. B) steep parts of the dome collapse and cause small pyroclastic flows. C) fast-moving, low-viscosity lava carries away part of the dome. D) the center of the dome collapses, forming a composite volcano. E) All of these are correct.
The coast of Brazil is a location of many hurricane strikes coming in from the Atlantic Ocean
Indicate whether the statement is true or false
Which of the following choices describes a recent development in wind power?
A) It is impossible to develop offshore wind farms. B) Turbines are getting larger and larger. C) Blades are being made heavier to withstand higher winds. D) The electricity produced is much more costly than from a coal-fired power plant. E) Some new turbines have no gearbox mechanisms.