Norder to us find our exact location, gps uses signals that are broadcast from and interpreted by a. airplanes . . receivers b. balloons . . software c. aerial photos . . software d. satellites . . receivers

lost > < > < > < > < > < > < > > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > > < > < > < > < > > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > > > > < > < > < > < > < > < > > < > < > < > < > > < > < > < > < > < > > < > < > < > < > > < > < __a__t__l__a_s_|

| |

||

answer: the correct answer is d. a christian revivalist movement in the u.s. during the early 19th century

explanation: the second great awakening was lead by the preachers of baptist and methodist congregations in order to gain support for the protestant religion from the 1790's to 1840's