Evaporites in the rock record commonly indicate a period of arid climate
a. True
b. False
True
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A car travelling at 20 km/h has the same kinetic energy as a car of twice the mass. What is the speed of the heavier car?
A. about 21 km/s. B. 10 km/h. C. about 14.2 km/h. D. not possible
The four thermal layers of the atmosphere in order beginning from the surface are:
A) mesosphere, stratosphere, thermosphere, troposphere. B) thermosphere, stratosphere, mesosphere, troposphere. C) troposphere, stratosphere, mesosphere, thermosphere. D) stratosphere, troposphere, mesosphere, thermosphere.
A 340-Hz sound wave travels at 340 m/s in air with a wavelength of
A. 10 m. B. more than 100 m. C. 1 m. D. 100 m.
The economic fortunes of Appalachia have been based on the unstable market for
A. water power B. tobacco C. coal D. manufactured goods