Deltas are divided into following six types on the basis of shape and growth: 1. Arcuate Delta 2. Bird-Foot Delta 3. Estuarine Delta 4. Truncated Delta 5. Growing Delta 6. Blocked Delta. Type # 1. Arcuate Delta: Such deltas are like an arc of a circle or a bow and are of lobate form in appearance wherein middle portion has [...]
The following points highlight the top four theories for the development of pediments. The theories are: 1. Lawson's Recession Theory 2. Sheet-Flood Theory of McGee 3. Lateral Erosion Theory 4. Composite Theory. 1. Lawson's Recession Theory: According to A.C. Lawson (1915) pediments are developed because of gradual recession of mountain front caused by weathering and erosion. Due to backwasting of [...]
Badland, pediments, bajadas and playas are special types of landforms of arid and semi-arid regions caused by mechanical disintegration of rocks and water action. 1. Badland Topography: The regions of weak sedimentary formations are extensively eroded by numerous rills and channels which are occasionally developed due to occasional rainstorms. The linear fluvial erosion results in the formation of ravines and [...]