Deforming the Earth's Crust

DEFORMING THE EARTH'S CRUST

By Diana Luna

is the theory that the Earth's lithosphere is divided into tectonic plates that move around on top of the asthenosphere.

Plate Tectonics

​Tectonic Plate Boundaries

Ridge Push

3 possible forces of plate tectonics

Slab Pull

Convection

The video on the next slide will explain this.

PAY ATTENTION

Multiple Choice

Which boundary forms by two plates moving away from each other?

• Divergent

• Convergent

• Transform

Multiple Choice

Transform Boundary

• The plates move away from each other

• The plates collide with each other

• the plates are sliding past each other

Multiple Choice

Which one is not one of the possible forces of plate tectonics

• Ridge Push

• Sea-floor Spreading

• Convections

• Slab Pull

The process by which the shape of a rock changes because of stress.

DEFORMATION

A type of stress that occurs when an object is squeezed, such as when 2 tectonic plates collide.

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OCCURS AT CONVERGENT BOUNDARY​

Compression

Another form of stress occurs when forces act to stretch.

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This tension occurs at divergent boundaries when 2 plates pull away from each other.​

TENSION

FOLDING

​is when rock layers bend because of stress in the Earth's Crust​

Three types of Fold:

Anticlines, Synclines, and Monocline​

Upward-arching folds

ANTICLINES

Down-Ward folds

SYNCLINES

Rock layers are folded so that both ends of the fold are horizontal.

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It looks like a stack of papers

MONOCLINE

Multiple Choice

Compression is

• Occurs at Convergent Boundary and it's like a force that squeezes.

• Occurs at transform boundary and its like a force that squeezes

• Occurs at the divergent boundary and it's like a force that squeezes

Multiple Choice

What stress for act like it is stretching the plate boundaries and happens at the divergent plates?

• Mountains

• Folding

• Tension

• Compression

Multiple Choice

Deformation is the process by which the shape of a rock changes due to stress.

• True

• False

Multiple Choice

Which one is NOT a type of fold?

• Monocline

• Syncline

• Anticlines

• Incline

Poll

How do you feel about the old terms you are reviewing and the new terms you are learning?

GO TO YOUR SCIENCE ISN

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• ​In your own words, list and briefly describe the three possible forces of tectonic plates​

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• In your own words, list and briefly describe the three ty​pes of fold

Answer the following questions. You don't need to write the question in your notebook. Just make it look that the example below.

​Forces of Tectonic Plates

Force 1

Force 2

Force 3​

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​​Types of Fold

Fold 1

Fold 2

Fold 3​

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