What are maintenance rehearsal and elaborative rehearsal?

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Explanation:

Maintenance rehearsal involves repeatedly processing an item at the same level (Baddeley, 2009), which requires little attention. ... In elaborative rehearsal, the information is processed at a deeper level and has the ability to move to long-term memory.

answer; eliminate parking problems in cities, because a car took up only half as much space as a horse and buggy;

world war i had a devastating effect on german-americans and their cultural heritage. up until that point   german-americans, as a group, had been spared much of the discrimination, abuse, rejection, collective mistrust experienced by so many different racial and ethnic groups in the history of the united states. indeed, over the years, they had been viewed as a well integrated and esteemed part of american society. all of this change with the outbreak of war.