Extractive activities are considered to be what sector of the economy?
A) quaternary
B) secondary
C) tertiary
D) primary
E) none of the above
Answer: D
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Global positioning systems (GPS) can "know" their location by
A) measuring the time required for radio signals from four or more satellites to reach the receiver. B) relating changes in detected radiation to changes in the position of the Sun. C) continually measuring changes in angle to a stationary reference point, such as a streetlight, in the area of the receiver. D) relating slight changes in magnetism and gravity to changes in the distance and direction of movement from the point at which the location of the receiver was last calibrated.
The Earth's magnetic field is generated by
A) salty water moving through the deep parts of the crust. B) convection currents in the asthenosphere. C) movement of iron and electrical currents within Earth's outer core. D) aligned magnetic minerals within Earth's inner core.
The present weather depicted by this station model is
A) light snow. B) light rain. C) moderate rain. D) heavy rain.
Which of the following molecules can have only London dispersion forces?
A) CH4 B) CO2 C) both a and b D) neither a nor b