Why is it hard to breathe at the top of Mt. Everest?
Atop Mt. Everest, air pressure is only one-third the pressure at sea level. Reduced air pressure means that there are fewer air molecules in a given volume of air, so less oxygen will be contained in each breath.
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________ is defined as the number of protons plus the number of neutrons
A) Isotopic number B) Atomic number C) Mass number D) Nuclear number E) Ionic number
Which of the following statements about deserts is true?
A) Although rainfalls are infrequent, erosion and deposition related to water are important in deserts. B) Deserts are located where there are ascending air masses and low atmospheric pressure. C) Deserts are defined by their sand content. D) Deserts are always located in hot, humid coastal areas.
The Colorado Plateau is marked by peculiar, step-like bends in rock layers called ________.
A. mesas B. buttes C. cuestas D. hogbacks E. monoclines
What is the term for a well where water freely flows to the surface?
A. Hydraulic well B. Extraction well C. Artesian well D. Water-table well