The openings on the surfaces of plant leaves through which gases move into and out of are known as
A) guard cells. B) stomata. C) chlorophyll. D) chloroplasts.
B
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Steel wool wetted with vinegar is sealed within a balloon inflated with air. After several hours, what happens to the volume of the balloon?
A. The balloon dissolves. B. The balloon inflates. C. The balloon deflates. D. Nothing because the vinegar is acting on the steel wool, not upon the balloon.
Although many thousands of weather observations are taken worldwide each day, what regions still have sparse observations?
A) over high mountains and deep valleys B) over oceans and higher latitudes C) over oceans and high mountains D) over higher latitudes and deep valleys
Factor(s) that interact to make streams seek equilibrium include the ________.
A. amount of sediment waiting to be moved B. volume of water discharged by the stream C. slope of the stream bottom D. sinuosity of the stream path E. All of these choices are correct.
Global belts of prevailing winds are caused by
A. the lower spin velocity and lower atmospheric solar heating at the equator. B. the higher spin velocity and higher atmospheric solar heating at the equator. C. the lower spin velocity and higher atmospheric solar heating at the equator. D. the higher spin velocity and lower atmospheric solar heating at the equator. E. None of these choices are correct.