The Coriolis effect describes how Earth’s rotation steers winds and surface ocean currents. Unlike land, air and water move freely (in the absence of obstacles). The Coriolis effect causes the path of a freely moving object to appear to curve. This is because Earth is rotating beneath the object. So even though the object's path is straight, it appears to curve. The curve appears to be to the right in the Northern Hemisphere. It appears to be to the left in the Southern Hemisphere.
Mark liked photography and spent his spare time taking pictures of his home town and the surrounding areas. Mark was hoping to get some nice areal images to add to his collection . He attached a camera to a weather balloon and released it above his small town. Mark watched as the balloon floated higher and began to drift away.
If the balloons path appeared to curve left was Mark in the Northern or Southern Hemisphere?