Where does the glider rise and why?

A glider rises when it encounters upward air currents, such as thermals, which are columns of warm air that ascend due to being heated by the sun. As the glider enters these rising columns, the lift generated by the wings increases, allowing it to gain altitude without the need for an engine. Additionally, gliders can soar along ridges where wind is forced upwards by terrain, providing another mechanism for rising.