Briefly describe how a hydrogen fuel cell works to produce electricity
What will be an ideal response?
Hydrogen atoms are first stripped of their electrons, producing positively charged hydrogen ions. Then the electrons move from a negative electrode to a positive electrode creating an electrical current. The hydrogen ions move through a proton exchange membrane and combine with oxygen and electrons in the positive electrode to form water.
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Each of the three population pyramids (above) are census tracts from St. Louis County in northern Minnesota, that stretches from Duluth to Canada. The population pyramid on the left most likely represents
A) a rural population with high out-migration after high school. B) an urban population with a high number of immigrant workers. C) the part of the county with the University of Minnesota-Duluth in it. D) a retirement community on the border with Canada. E) The median census tract, where all the women are strong, the men are good-looking, and the children are above average.
What is the approximate population of Southwest Asia and North Africa?
A) 100 million B) 200 million C) 500 million D) 700 million E) 1 billion
An annual population growth rate of +1% corresponds to a situation where there are 100 more deaths
per thousand individuals than live births in a given year.c Indicate whether the statement is true or false.
Which is a type of a plate boundary?
A. transform B. convergent C. divergent D. All of these choices are correct.