Plate tectonics
This presentation is the property of its rightful owner.
Sponsored Links
1 / 12

Plate Tectonics PowerPoint PPT Presentation


  • 77 Views
  • Uploaded on
  • Presentation posted in: General

Plate Tectonics. Part Two: Sea Floor Spreading. TOC = “Sea Floor Spreading”. Objective:. TEKS 8.9A. Explain following about seafloor spreading theory: Whose idea and when presented Describe evidences to support What was the importance of this discovery What is reverse magnetism.

Download Presentation

Plate Tectonics

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Plate tectonics

Plate Tectonics

Part Two: Sea Floor Spreading


Plate tectonics

TOC = “Sea Floor Spreading”


Objective

Objective:

TEKS 8.9A

Explain following about seafloor spreading theory:

  • Whose idea and when presented

  • Describe evidences to support

  • What was the importance of this discovery

  • What is reverse magnetism


Atlantic ocean growing

Atlantic Ocean Growing ?

Engage

  • Is the Atlantic Ocean growing? Explain

  • If it is, explain why Earth is not getting bigger.

  • If it is not, explain why volcanoes produce more land, yet the oceans still cover most of Earth.


Atlantic ocean growing1

Atlantic Ocean Growing ?

Explore

  • Demo (Click)


Atlantic ocean growing2

Atlantic Ocean Growing ?

Explore

In journal draw picture of model from video and label the parts.

Write the question OR restate question in answer

  • How does this model seafloor spreading

  • What do the marks on the paper represent

  • Based on this model, where is the oldest rock on the seafloor found


Evidences

Evidences

Explain

  • Video(click here for you tube video)

  • Harry Hess develops Sea Floor Spreading Theory

  • Theory based on sonar (depth sounding device)

    • Discovered the Mid-Atlantic Ridge (mountain under water)

    • Newer rocks found in middle of ocean, older rocks found near continents

    • Earth crust recycled via method called subduction

  • Gave support to Wegener’s Continental Drift Theory


Evidences1

Evidences

Explain

Wegener’s Continental Drift Theory

+

Hess’s Sea Floor Spreading Theory

=

Plate Tectonic Theory


Reversed magnetism

Reversed Magnetism ?

Elaborate

We know a compass will point to the north pole.

Do you think it will point to the south pole?(click)


Closure

Closure:

TEKS 8.9A

Write the question OR restate question in answer

Who developed theory of Sea Floor Spreading?

How did he support his theory?

What was the importance of this discovery?

What is reverse magnetism?


Closure1

Closure

TEKS 8.9A

TOC: “Plate Tectonic Concept Map”

Working in pairs create a concept map to include following ideas.

Alfred Wegener

Plate Tectonics

Continental Drift

Harry Hess

Sea Floor Spreading

Evidences of continental drift

Evidences of sea floor spreading


Concept map how to

Concept Map - How to

Start with one word or idea everything falls under

Like in this case Plate Tectonics

Then what are key points of plate tectonics

Yep, ur right – Continental Drift

- Sea Floor Spreading

Under Continental Drift,

what do we know?

And so on


  • Login