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Types of Sand Dunes

In this Geoshortqa we are going to know about types of Sand Dunes. Types of Sand Dunes, Geoshortqa Sand Dunes Sand dunes are heaps of sand found in deserts . Generally , their heights vary from a few metres to 20m , but in some cases dunes are several hundred metres high and 5 to 8 km long .   The formation of sand dunes requires  • Wind of high velocity  • Abundant sand  • Obstacles such as trees , bushes , forests , rock outcrops , walls against , which dunes may settle  • Ideal places i.e. dune complex , dune colony or dune chain . Dunes formed due to obstacles like hushes , walls etc. are called nebkhas , where dune formed besides desert depressions are called lunettes.   Dunes are classified on the basis of morphology , structure , orientation , location , internal structure , ground pattern and number of slip faces . These are the various types of sand dunes  a) Transverse Dunes are dunes deposited transverse to the prevailing winds direct...
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Urban System - Primate City and Rank Size Rule


In this Geoshortqa we know about Urban System 

Urban System

There are different urban systems that co-exist together in any urban region of the world. These systems are classified on th basis of size and spatial distribution as there is a certain degree of organisation in their size and spatial order. 


These urban systems include small towns, medium sized towns and large cities. To study the order of size relationship and spatial distribution, relation between city rank and city size (in terms of population) is to be examined. The Law of Primate city and Rank size rule depict the relation between the size and spatial distribution of towns.


Urban System, Geoshortqa


Primate City

The law of Primate city by Mark Jefferso in 1939


Main theme :


The Law of Primate City is premised on the observation that the country's leading city is usually disproportionately larger than others in the system. e.g. Copenhagen is nine times the size of Aarhus etc. According to Jefferson, "Primate city has pre-eminence in infrastructure, economic, social and political affairs".


Rank size rule

The rank size rule by George Kingsley Zipf in 1949


Main theme :


Principle Rank size rule expresses the relationship between towns in mathematical terms and advocates that 'if all the urban settlements in an area are ranked in descending order of population, the population of the nth town will be 1/nth that of the largest town.'


Thus, the population of urban settlements in a region can be arranged in series of 1, 1/2, 1/3, 1/4......1/n and this regularity can be expressed as

Pn=P1/n

Where,

 Pn = Population of town of rank n in descending order

 P1 = Population of largest city

 n = Value of rank

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Famous Theory, Model and Concepts related to geomorphology

 In this Geoshortqa we know about some famous Theory,  Model and Concepts related to geomorphology. Famous Theory, Model and Concepts related to geomorphology, geoshortqa Theory, Model and Concepts   Name                                    Proponent ✓ Complete Cycle Of River Life    -   W.M Davis  ✓ Base Level Of Erosion         -          J.W Powell ✓Karst Cycle Of Erosion   -    Beede and Cvijic ✓ Dynamic Equilibrium Theory      -    J.T Hack ✓Cyclic Nature Of Earth History    -   Hutton  ✓Panplanation               -           C.H Crickmay  ✓Episodic Erosion Model      -      S.A Schumm ✓Graded Stream          ...
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Isoline

In this Geoshortqa , we know about isoline or contour line. Isoline, geoshortqa Contour line or Isoline  : Joins points of the same height above ground.
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Isoquant

  In this Geoshortqa we know about Isoquant   Isoquant, Geoshortqa Isoquant  In Microeconomics, is a line joining points at which the equal quantity of output is produced.
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Isohel

  In this Geoshortqa we know about isohel Isohel An imaginary line joining points on a map having the equal amount of sunshine.
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Types of Shock Waves

  In this Geoshortqa we know about  Types of Shock Waves. Shock waves, Geoshortqa Types of Shock Waves (a) Undisturbed materials   At the vary beginning there was no wave action found and all the materials are undisturbed Undisturbed materials, Geoshortqa  There are mainly two types of shock waves are found   1) Body  Waves  These travel through the crust and are of two types  (b) Primary (P) Waves  which cause the crustal rock to move back and forth in the direction of wave movement. Primary (P) Waves , Geoshortqa * click on photo for getting higher resolution  (c) Secondary (S) Waves  which cause the crustal rock to move from side to side i.e. at right angles to the direction of wave movement. Secondary (S) Waves, Geoshortqa 2)  Surface Waves  These travel through the surface rocks and are of two types  (d) Love (L) Waves  which cause the surface rocks to more from side to side, at right angles to th...
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Internal structure of the Earth

In this Geoshortqa we know about the Internal structure of the Earth Internal structure of the Earth, geoshortqa  
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