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Kritika Trehan 8 years ago
Oasis is form in desert when there is underground river or water source beneath the surface, the water gets accumulated below the sand because of rocks beneath which water can't percolate. So it becomes naturally fertile for plants. Sometimes migrating bird pass by over it, they stop by for water which can be the reason for natural seed planting I guess, not sure about it.
Oasis keeps on thriving in such hot and dry topology is another story. The water source of the oasis is or can be maintained via various ways depending upon its location/topology. The ways of water replenishment are as follows-
1. An underground water source, a river or crevice leading to a distant water source.
2. Occasional thunderstorms.
3. Pressure difference between underground water source and crest surface.
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Kritika Trehan 8 years ago
Quṭb al-Dīn Aibak also spelled Quṭb ud-Dīn Aibak or Qutub ud-Din Aybak, (1150–1210), was the founder of the Mamluk Dynasty in Delhi and the first sultan of the Delhi Sultanate. He was born a Turk of the Aybak tribe and was the sultan for only four years, 1206-1210.
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A perennial river is a river which flows throughout the year and are also known as permanent rivers. They can be contrasted with non-perennial or seasonal rivers which have water flow only during certain periods of the year or have intermittent flow. There is no requirement as to the minimum level of water to be maintained in order for a river to be a perennial river. Examples of perennial rivers include Ganga, Yamuna, Brahmaputra etc.
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