The cycling of chemical substances throughout the biosphere is accomplished through
A. vertical transfer of momentum.
B. the rock cycle.
C. the first law of thermodynamics.
D. the work of living things and physical and chemical processes.
Answer: D
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Which of these energy sources has the highest net energy yield to produce high-temperature industrial heat?
A. coal B. passive solar C. geothermal D. uranium
As you walk across a sandy beach on a summer day, the bottoms of your feet become extremely hot. This is an example of which type of heat transfer?
A. radiation B. ultrasonic C. conduction D. convection
Which of the following types of solids does not typically have a well defined melting point?
A) amorphous B) ionic C) molecular D) network covalent
What causes most places on Earth to have seasons?
a) Earth is closer to the Sun in the Northern Hemisphere summer and farther away in the Northern Hemisphere winter. b) The spin axis is tilted 23.5. degrees to the plane of Earth's orbit, causing solar radiation to vary in angle as Earth revolves around the Sun. c) The spin axis changes with tilt, causing winter when the tilt is great and summer when the tilt is small. d) Days are longer during summer than winter, so the extra sunshine causes it to be warmer in summer and less sunshine causes it to be colder in winter. e) There is more ice in winter, so it is colder, and less in summer, when it is warmer.