Why ocean are salty and great lakes are not? The source of river water are usually snow melt or rain, so it always starts off fresh. But minerals are also dissolved into the river water, so more minerals ultimately â¦ end up in the ocean.
The average annual boarding school tuition is $38,850. Of course, there are some schools with tuition as low as $10,000 and others as high as $60,000.
The average room and board expense for the 2008-2009 school year at public colleges is $7,748 and $8,989 at private colleges, an average cost that has gone up about 5% since last year.