i) Sheet Rocks are large areas of rock where the overlying soil layers have been eroded and removed due to mechanical weathering. ii) A causeway is a raised metalled road across a minor stream or a low-lying marshy area. iii) Open scrub is a vegetation found in regions with less than. 100 cms of rainfall. Therefore it indicates a dry region. iv) Rock outcrop is the part of a rock formation that appears above the surface of the surrounding land. v) Stony Waste is a large area usually in arid/semi arid regions where the finer sand/soil has blown away leaving a surface covered with boulders, stones and pebbles.