The earth has a magnetic north and south. how does this up with evidence to support the theory of continental drift?

Easy.  The  magnetic poles shift at regular intervals.
The ocean floor  at  the mid Atlantic   ridge  shows  the    North/South reversals  at regular   intervals and the pattern is the mirrored  on both sides of the rift.

Answerhave flowing water either episodically or during only a portion of the year;

343^x = 49^4-xx = 4-xx+x=42x = 4x = 4/2x = 2therefore x = 2