It depends on what you're asking. If angle a and b are both on a straight line, b would equal 169 degrees because the total has to add up to 180 degrees, but if they are on a right angle, b would equal 79 because it has to add up to 90 degrees.
Migration is when the birds go from south to north, north to east, east to north, and south to east.
The reasons for migration is that when it is cold the births fly north to south to find somewhere warmer (Like Florida). Birds can't fly in the cold so they fly to the warmer area.
The answer is: [B]: Georgia .
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Erosion is largely caused by Glaciers.
