Moraine: When a glacier melts or retreats, it deposits its load in the different parts. The debris thus deposited are called moraines. Moraines are of four types according to their location in the valley. They are:
1. Terminal moraine: When the debris are deposited at the end of the valley glacier in, form of a ridge, it is called terminal moraine.
2. Lateral moraine: They form along the sides parallel to the glacial valleys.
3. Medial moraine: The moraine in the centre of the glacial valley flanked by lateral moraines is called medial moraine.
4. Ground moraine: Many valley glaciers retreating rapidly leave an irregular sheet of till over their valley floors. Such deposits, varying greatly in thickness and surface topography are called ground moraines.
Erosional activity of winds in deserts: Winds are one of the two dominant agents of weathering in hot deserts. Winds move along the desert floors with great speed and the obstructions in their path create turbulence. A number of interesting landforms are created by the erosional activities of winds in deserts. Some of them are pediments and pediplains, playas and alkali flats, deflation hollows and caves and mushroom, table and pedestal rocks.
