which country gad the fewest number of electric generation stations by 1913? which country hadthe largest number? why was there such a difference between the two contries?

What would lead a historian to consider two events to have a relationship of correlation rather than causation?

Will have the greatest effect on human health. pollution in the a. troposphere b. stratosphere mesosphere d. thermosphere

    which of the following was anecological  result of european exploration from 1400 to 1800?   a.  increased trade with east asia      b.  the spread of epidemic diseases      c.  expansion of english territory      d.  the spread of christianity