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Chapter 5 Deformation of the Crust. Section 5.1  Some changes in the earth’s crust occur because of changes in weight of some part of the crust.  When.

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Presentation on theme: "Chapter 5 Deformation of the Crust. Section 5.1  Some changes in the earth’s crust occur because of changes in weight of some part of the crust.  When."— Presentation transcript:

1 Chapter 5 Deformation of the Crust

2 Section 5.1  Some changes in the earth’s crust occur because of changes in weight of some part of the crust.  When parts of the crust become thicker and heavier, they will sink.  If they become lighter and thinner, it will rise.

3 Section 5.1  The balancing of the mantle pushing up and the crust pushing down is called isostasy.  The up and down movements of the crust is called isostatic adjustments.

4 Section 5.1  Isostatic adjustments are constantly happening.  The wearing away of rocks can reduce the height and weight of a mountain.

5 Section 5.1  Rivers can carry large amounts of mud, gravel, and sand into an ocean and pile up.  Adjustments can also be found where glaciers once covered the land

6 Section 5.1  Crustal stress occurs when plates collide, separate, or rub together.  Strain is a change in the shape or volume of rocks because of the stress of being squeezed, twisted, or pulled apart

7 Section 5.1  Compression occurs when crustal rocks are squeezed together  Tension pulls rocks apart  Shearing pushes rocks in opposite directions

8 Section 5.2  Folding of rocks occurs when rocks are permanently deformed but no broken  3 types of folds  Anticlines are upward curved folds where the oldest layer is in the center. Like a hill

9 Section 5.2  Synclines are downward folds where the youngest layer is in the center. Like a valley  Monoclines are folds where both limbs stay horizontal

10 Section 5.2  Rocks do not always fold.  They often break from the stress.  If there is no movement in the break it is called a fracture.  If there is movement it is called a fault.

11 Section 5.2  A fault plane is the surface of a fault where motion occurs.  The hanging wall is the rock above the fault plane  The footwall is the rock below the fault plane

12 Section 5.2  A reverse fault causes the hanging wall to move up.  A thrust fault is almost horizontal  A strike-slip fault is where the rocks are moving horizontally

13 Section 5.3  A mountain range is a group of adjacent mountains with the same general shape and structure  A mountain system is a group of adjacent mountain ranges  A mountain belt is a group of mountain systems

14 Section 5.3  Mountains can form when Continental crust collides with other continental crust or with oceanic crust.  Mountains can also form when oceanic crust collides with oceanic crust.

15 Section 5.3  The highest Mountains Ranges in the world are made of folded mountains that usually are made when 2 continental plates collide.  Volcanic Mountains form when molten rock erupts to the surface.

16 Section 5.3  The northern oceanic crust of the African plate, which is the seafloor of the Mediterranean Sea, is still subducting beneath the continental crust of Eurasia.  Eventually the Mediterranean Sea will become smaller and smaller and disappear.


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