The History of Tectonic Theory Presented by Doug Winans Grade Levels 5-8.

Slides:

Advertisements

Similar presentations

Continents change position over time

Advertisements

Earth’s Structure View of Earth from moon. We know what the surface of the Earth looks like. What does the inside look like?

Coach Williams Room 310B.  Plate Tectonics Objectives  Describe one piece of early evidence that led people to suggest the Earth’s continents my have.

Wegener’s principle of continental drift was often dismissed because he failed to produce a mechanism by which the continents moved.

CONTINENTAL DRIFT In 1812, Alfred Wegener presented his scientific theory called “Continental Drift”. It was based on his belief that the continents.

Earth’s Interior By Aimee Chavez.

Plate Tectonics Theory. Lithosphere Consists of continental, oceanic and upper part of mantleConsists of continental, oceanic and upper part of mantle.

Plate Tectonics The theory --the surface of the Earth is broken into large plates. The size and position of these plates change over time. The edges of.

The History of Continental Drift and Plate Tectonics.

Chapter 7.2 Restless Continents pgs

Plate Tectonics Section 1 Section 1: Continental Drift Preview Key Ideas Wegener’s Hypothesis Sea-Floor Spreading Paleomagnetism Wegener Redeemed Continental.

Plate Tectonics How did a glacier form over hot, arid Australia?

 All of the phenomena that we will discuss over the next month are all a result of plate tectonics.  Plate Tectonics is the idea that the Earth is broken.

The Dynamic Earth and Plate Tectonics. Early Ideas on a moving Earth Alfred Wegener proposed idea: “Continental Drift” – Stated that all continents used.

17.1 Drifting Continents. Early Observations  In the late 1500s, mapmakers noticed the apparent “fit” of the continents on either side of the Atlantic.

Chapter 10 Plate Tectonics. Alfred Wegener Proposed they hypothesis of continental drift Proposed they hypothesis of continental drift CONTINENTAL DRIFT-

1 Natural Disasters Plate Tectonics & Physical Hazards Current Event--Mammoth Chile Earthquake Chile Tsunami.

Continental drift -- One theory's journey Today, you'd be laughed out of a geology course for questioning whether continents move through geologic time.

 ASTHENOSPHERE: An area of earth’s upper mantle that has a low density and partially melted rock material.

AIM: What evidence do we have for the Theory of Plate Tectonics?

Continental Drift 225 million years ago. Continental Drift million years ago.

WARM-UP # 52 What is ONE piece of evidence that the continents were once all joined together? You know two – fit together like a puzzle and matching fossil.

EQ: How do lithospheric plates move and how do they affect the Earth’s surface?

Continental Drift and Sea Floor Spreading

Earth’s Structure. Origin of the Earth Meteors and Asteroids bombarded the EarthMeteors and Asteroids bombarded the Earth Earth is 4.6 billion years old.

Chapter 17.1 Plate Tectonics.

Plate Tectonics.

Plate Tectonics Current Theory. Plate Tectonics  Theory that explains how large pieces of the lithosphere (Plates) move and change shape (Holt 247).

Continental Drift Theory

12.1 Evidence for Continental Drift

Mini Quiz What happens in Earth’s interior to produce Earth’s magnetic field? 2. Rocks on continents are billions of years old, while the oldest.

The Theory of Continental Drift Continental drift was proposed by Alfred Wegener He used the following ideas to support his theory: 1. The fit of the.

Forces behind change Plate tectonics. Focus Questions How does the movement of the earth’s plates cause land features? What evidence supports the theory.

Continents change position over time

Objective You will use the theory of plate tectonics and the changes in the earth’s surface in order to explain the evidence for continental drift theory.

Plate Tectonics and Continental Drift. Continental Drift Alfred Wegener believed that the continents were once connected. This large continent was called.

Evidence for Continental Drift Wegener (1915) proposed Pangaea – one large continent existed 200 million years ago Wegener (1915) proposed Pangaea – one.

Earth’s Structure and Pangaea. Review Inside the Earth The Earth has 4 main layers. 1.Crust (rock) 2.Mantle (rock) 3.Outer Core (metal) 4.Inner Core (

Continental Drift, Plate Tectonics, and Seafloor Spreading Physical Geography 110.

Plate Tectonics. Plate Tectonics is a theory that describes the formation, movements, and interactions of Earth’s plates.

Plate Tectonics Unit:. Composition of the Earth: Layers of the Earth: 1.Crust: 5-100km thick. a.Oceanic crust: thin and more dense, mostly basalt b.Continental.

“Restless Continents”. A. One scientist who looked at the pieces of this puzzle was Alfred Wegener. 1. In the early 1900s, he wrote about his hypothesis.

Africa The Red Sea between Africa and the Arabian peninsula in Asia marks a region where two pieces of the lithosphere are slowly moving apart. Over the.

Earth’s Structure and Pangaea. Review Inside the Earth The Earth has 4 main layers. 1.Crust (rock) 2.Mantle (rock) 3.Outer Core (metal) 4.Inner Core (

CHAPTER TEN PLATE TECTONICS. Background Information  The Earth is made up of several layers that have different properties and compositions.  There.

Plate Tectonics & The Ocean Floor. Layers of the Earth (1.4)

Earth Structure. Mexico quake-- magnitude at 7.0, and epicenter was in the western Pacific state of Michoacan. Its depth was about 40 miles Mexico quake--

Plate Tectonics.  TOD: IN (Page: 34)  Brainstorm a list of all you know about Plate Tectonics.  Agenda:  TOD IN  Plate Tectonics Notes Page 35 of.

List 1 fact about Earth. Agenda for Monday Nov 22 nd 1.Finish Movie 2.Layers of the Earth notes.

17.1 Drifting Continents Plate Tectonics.

CONTINENTAL DRIFT Alfred Wegener (1915) introduces CONTINENTAL DRIFT HYPOTHESIS. Super-continent Pangaea separated 200 million years ago. Evidence:  Fit.

Continental Drift Theory Proposed by Alfred Wegener in million years ago, all of the continents were combined into one super-continent called.

PLATE BOUNDARIES Day 1. A. Geographic Puzzle 1. Alfred Wegener - a scientist that first believed that the continents fit together like a puzzle a) Ex:

8. 2 Continents change position over time. Learning Goals Students will: -explain how the continental drift hypothesis was developed. -explain evidence.

 Continental Drift: Theory that states that the continents have drifted from one location to another over time  Wegener’s support to his hypothesis:

The Theory of Plate Tectonics and Continental Drift Write down the underlined items for your notes. Feel free to put the material in your own words.

Continental Drift Hypothesis proposed by Alfred Wegener in 1915 The idea that Earth’s continents were once joined in a single landmass and gradually drifted.

Section 1: Continental Drift

Earth’s Structure and Pangaea. Review Inside the Earth The Earth has 3 layers. 1.Crust 2.Mantle 3.Core.

Earth’s Structure and Pangaea. Review Inside the Earth The Earth has 4 main layers. 1.Crust (rock) 2.Mantle (rock) 3.Outer Core (liquid metal) 4.Inner.

Topic: Continental Drift

Plate Tectonics.

Continental Drift and Sea Floor Spreading

Bellwork Box #7 Read page 248:

Restless Continents Chapter 4: Lesson 2 Page95-98.

Continental Drift By: Ms. R. Wallace, WFHS.

Continental Drift By: Ms. R. Wallace, WFHS.

Earth Science- The Earth’s Moving Plates

Plate Tectonics.

Continental Drift and Plate Tectonics

Presentation transcript:

The History of Tectonic Theory

Presented by Doug Winans Grade Levels 5-8

Continental Drift Hypothesis Scientists noted geographic fit of continents 1885 Austrian geologist Edward Seuss notes similarities between plant fossils, and calls the continent "Gondwanaland" American physicist Taylor proposes concept of continental drift to explain formation of mountain belts. 1912, Wegener names the ancient super-continents "Pangea," based on evidence from geology, climatology and paleontology. Supporting evidence for Continental Drift Hypothesis Geographic fit Geographic fit Fossils Fossils Mountain Belts Mountain Belts Glaciation Glaciation

Geographic Fit Continents appear to fit together like pieces of a puzzle

Fossils Distribution of fossils found on both sides of the Atlantic Ocean, such as Mesosaurus, and a prehistoric plant called Glossopteris.

Mountain Belts Mountain belts, like the Appalachians, match across oceans

Glaciation Glacial scoring indicates original location of glaciers and direction of movement Striations are grooves carved in rock by glaciers Blue arrows show direction of glacial flow away from South Pole 

Continental Drift Hypothesis Alfred WegenerAlfred Wegener MeteorologistMeteorologist Presented his hypothesis to other professionals, but could not explain how continents driftedPresented his hypothesis to other professionals, but could not explain how continents drifted Try to put together Wegner’s Pangea Pangea

Seafloor Spreading

Seafloor Spreading Development of a New Theory Continental drift hypothesis was reexamined in 1960’s with new information.Continental drift hypothesis was reexamined in 1960’s with new information. Seafloor SpreadingSeafloor Spreading Evidence supporting seafloor spreading…Evidence supporting seafloor spreading… –Paleomagnetism –Age of Seafloor

Seafloor Spreading Harry Hess suggests new seafloor is created at mid-ocean ridges and is destroyed in deep ocean trenches

Paleomagnetism Earth’s magnetic field reverses approx. every 600,000 yearsEarth’s magnetic field reverses approx. every 600,000 years As new crust is formed, normal and reverse polarities are preserved in the rock recordAs new crust is formed, normal and reverse polarities are preserved in the rock record 1963, Vine & Matthews observe magnetic anomalies in oceanic crust1963, Vine & Matthews observe magnetic anomalies in oceanic crust

Younger rocks (red) are found near mid-ocean ridgesYounger rocks (red) are found near mid-ocean ridges Further away, the age of seafloor gets progressively older (blue)Further away, the age of seafloor gets progressively older (blue)

Mechanism for Seafloor Spreading Convection CurrentsConvection Currents –As heated magma rises, it moves away at spreading centers pulling plates apart –Plates slide over the asthenosphere –The upper mantle then cools and becomes more dense – sinking at ocean trenches

Plate Tectonics Theory John Tuzo Wilson combined the ideas of Continental Drift and Seafloor Spreading into a new theory… “Plate Tectonics”

Tectonic Quiz What evidence was given for the Continental Drift Hypothesis?What evidence was given for the Continental Drift Hypothesis? Glaciation Fossils Geographic Fit All of the Above All of the Above

Tectonic Quiz Who proposed the Continental Drift Hypothesis?Who proposed the Continental Drift Hypothesis? Taylor Hess Wegner Seuss

Tectonic Quiz New evidence of “Seafloor spreading” was used to develop Tectonic Theory. What evidence did scientists find?New evidence of “Seafloor spreading” was used to develop Tectonic Theory. What evidence did scientists find? Ancient magnetic reversals in the rocks Ocean floor dating GPS measurements Both A and B above

Tectonic Quiz Who combined Continental Drift and Seafloor Spreading to produce Tectonic Theory?Who combined Continental Drift and Seafloor Spreading to produce Tectonic Theory? Taylor Hess “Tuzo” Wilson Seuss

Plate Tectonics History References Web Sites: Pangaea: The Continent What on Earth is Plate Tectonics? Geology Labs: Virtual Earthquake Understanding Quakes ALFRED WEGENER vs JUST ABOUT EVERYBODY ELSE: HOW THE CONTINENTS FORMED This Dynamic Earth: The Story of Plate Tectonics Testing the Sea-Floor Spreading Hypothesis