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Using complete sentences, describe the central economic problem facing all humans. why does this require people to make choices? how can this result in opportunity costs?

The lines marked by the letters a, b, and c on the map above represent a. chains of volcanoes b. earthquake fault lines c. thin strips of heavy forests d. major rivers that flow from north to south

What forms of energy are involved when snow on a mountain breaks loose, resulting in an avalanche? during an avalanche, the( 1 ) energy of the snow on the mountain is converted into ( 2 ) energy as the snow cascades down. ( 1 ) a. elastic b. kinetic c. potential d. radiant ( 2 ) a. chemical b. kinetic c. nuclear d. potential