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
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
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.