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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.

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Plate tectonics

Plate Tectonics

Part Two: 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