plate tectonics and continental drift teks objectives:
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Plate Tectonics and Continental Drift TEKS Objectives: (8.3) Scientific processes. The student uses critical thinking and scientific problem solving to make informed decisions. The student is expected to: - PowerPoint PPT PresentationTRANSCRIPT
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Plate Tectonics and Continental Drift
TEKS Objectives:• (8.3) Scientific processes. The student uses critical thinking and
scientific problem solving to make informed decisions. The student is expected to: – (A) Analyze, review, and critique scientific explanations, including
hypotheses and theories, as to their strengths and weaknesses using scientific evidence and information;
– (E) Connect Grade 8 science concepts with the history of science and contributions of scientists.
• (8.14) Science concepts. The student knows that natural events and human activities can alter Earth systems. The student is expected to: – Predict land features resulting from gradual changes such as mountain
building, beach erosion, land subsidence, and continental drift;
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Earth Systems
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Alfred Wagner 1910-1920
• Introduced The Theory of Continental Drift
• Based theory on:– S. America &
Africa– paleontology
(the study of fossils)
How do such large continents move?
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Arthur Holmes 1930’s
• Introduced supportive theory: Currents of heat and thermal expansion in the Earth's mantle move continental plates.
Convection!
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Great Global Rift Discovered!
• After WW1 – Germany found a mountain-like ridge that ran through the Atlantic to the southwest of Africa.
• Today it is call Mid-Atlantic Ridge
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Harry Hess 1950-1960
• Introduced supportive theory: sea-floor spreading!
• Different plate movements gave us different land forms: – Divergent = divide (Mid-Atlantic Ridge)– Convergent = come together (Himalaya Mt.
Range or Appalachian Mt. Range)– Transform = sliding (San Andres Fault)
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Seismology
• Seismology is the study of earthquakes.• Check out the data below that shows where
most earthquakes occur.
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Volcanology
• The Pacific Ring of Fire is an area of frequent earthquakes and volcanic eruptions.
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Plate Tectonics Theory
• Developed from – Puzzle piecing of the continents– Paleontology (the study of fossils)– Convection (movement of heat)– Great Global Rift (aka Mid-Atlantic ridge)– Sea-Floor Spreading– Seismology (the study of earthquakes)– Volcanology (the study of volcanoes)
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But….
• What if everything I told you was old and scientists have created a new theory?
• This new theory is not completely accepted, but how easily do people accept change?
• Keep in mind that our Earth is a celestial body and star characteristics might not be to far off.
http://www.newgeology.us/
http://www.youtube.com/watch?v=VjgidAICoQI&feature=related