EARTH MOVEMENT:FOLD// CLASS 11/B.A//B.SC//MSC// EXAMINATION

 

DEFINITION:

 wave like bends formed in crustal bends by tangential compressive forces resulting from the horizontal movement caused by endogenetic force originating deep within the earth are called fold

DIFFERENT ELEMENTS OF FOLD

1. Axis of fold:- the plane which bisects the angle between two limbs of the anticline or middle limb of the syncline is axis of fold or axial plane.

 2. Limbs: Two sides of fold is called limbs

3. Crest: the highest point  of a fold is called crest.

4. Trough : the lowest point of a fold is called trough.

5. . Strike: the strike is the direction of any horizontal line along a bedding plane

6. Dip: The inclination of rock beds with respect to horizontal plane is termed as Dip.

 TYPE OF FOLD

 

ANTICLINES:- The uploaded rock beds are called anticlines.

 Anticlinorium:- it refers to folded structures in the regions of folded mountains where are a series of minor anticlines and synclines within  one extensive anticline.

 

 3.Synclines: down folded rocks beds due to compressive forces are caused by horizontal tangential forces are called syncline. 

4.Synclinorium: it refers to folded structures which includes an extensive syncline having numerous  minor anticlines and synclines within  one extensive anticline.

SYMMETRICAL FOLDS: When two limbs of a fold is inclined uniformly and formed due to compressive force in both side having moderate intensity is called symmetrical folds.

 

ASYMMETRICAL FOLDS: It is characterized by unequal and irreguar limbs with different angles is called asymmetrical fold. One limb is relatively larger and inclination is also moderate and regular and the other limb is shorter and steep inclination

 

MONOCLINAL FOLDs are those in which one limb inclines moderately with regular slope and other limb is steep at right angle , and steep is almost vertical.Vertical force and movement are responsible for the development of this type of fold.

 

ISOCLINAL FOLDS are formed when compressive forces are so strong that the limbs of both sides become parallel each other but not in horizontal manner.

 

NAPPES:

 

Nappes are the result of complex folding mechanism caused by intense horizontal movement and resultant compressive force.The limbs of recumbent forces are parallel and horizontal. When these limbs are increased further due to compressive force , one limbe overrides other fold

 

 

READ MORE 

DOWNLOAD THE PDF CLICK HERE 

www.geographia97.blogspot.com

 GEOGRAPHIA

GENERAL KNOWLEDGE PART 1 CLICK HERE

GEOLOGICAL TIME SCALE IN ENGLISH CLICK HERE 
GEOLOGICAL TIME SCALE IN BENGALI  CLICK HERE .
পৃথিবীর অন্দরমহলের বর্ননা click here
interior structure of the earth click here 
KANT GASEOUS HYPOTHESIS CLICK HERE 
কান্টের গ্যাসীয় মতবাদ CLICK HERE

Free note for REMOTE SENSING AND GIS CLICK HERE
Regional planning in india click here

NCERT CLASS_6 SHORT NOTE CLICK HERE 

NCERT CLASS _6 SOLUTION CLICK HERE

ICSE class -ix click here

ICSE class -x click here

CLASS 6 WBBSE GEOGRAPHY CLICK HERE

জলবায়ুর শ্রেণীবিভাগপ্রশ্ন-উত্তর click here

REGIONAL THEORIES CLICK HERE

দ্বাদশ শ্রেণী ভূগোল CLICK HERE

CURRENT AFFAIRS CLICK HERE

NOTES OF HUMAN GEOGRAPHY AND AND POPULATION GEOGRAPHY click here

CONTINENTAL DRIFT THEORY BY FB TAYLOR CLICK HERE

CONTINENTAL DRIFT THEORY BY TAYLOR IN BENGALI CLICK HERE

CONTINENTAL DRIFT THEORY BY WEGNER CLICK HERE

CLIMATE OF INDIA CLICK HERE

ভূমিরূপ গঠন কারী প্রক্রিয়া ; উচ্চমাধ্যমিক ভূগোল click here

বহির্জাত প্রক্রিয়া ও তার ফলে সৃষ্ট ভূমিরূপ click here

মহিসঞ্চারন তত্ত্ব click here

Ugc net 2007 june paper 2 geography click here

Ugc net 2006 december paper 2 geography click here

UGC NET GEOGRAPHY 2007 DECEMBER CLICK HERE 

UGC NET GEOGRAPHY 2008 JUNE CLICK HERE

WB CLASS 6 GEOGRAPHY CHAPTER 4 CLICK HERE

UGC NET GEOGRAPHY 2009 JUNE CLICK HERE 

PLATE TECTONIC THEORY CLICK HERE

NCERT CLASS 7 GEOGRAPHY CLICK HERE 

CORAL REEF IN BENGALI NOTE CLICK HERE

CORAL REEF CLICK HERE 

HS GEOGRAPHY CLICK HERE 

GEOGRAOHICAL TERM  click here

 NTA NET GEOGRAPHY PYQS- MODELS AND THEORIES, 2020-2006, PART-1  CLICK HERE 

NTA NET GEOGRAPHY PYQS- MODELS AND THEORIES, 2020-2006, PART-2  CLICK HERE

 NTA NET GEOGRAPHY PYQS- MODELS AND THEORIES, 2020-2006, PART-3  CLICK HERE

 NTA NET GEOGRAPHY IMPORTANT ONE LINER , 2020-2006, PART-1  CLICK HERE

NTA NET GEOGRAPHY CLIMATOLOGY PYQS 2020-2006  PART 1 CLICK HERE

 NTA NET GEOGRAPHY GEOMORPHOLOGY 2020-2006 PART 1CLICK HER E

Thank you for visiting this page.we provide geography related study materials on daily basis..