Honors 1360 Planet Earth Last time: Leading Up to Plate Tectonics… Obs : Mountain mass balanced by deep buoyancy Hyp : “Solid” rock flows on long time.

Slides:

Advertisements

Similar presentations

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

Advertisements

Plate Tectonics Review

Tectonic Jeopardy!.

CONTINENTAL DRIFT, LAYERS OF THE EARTH, PLATE TECTONICS SI.

the continents were once joined together in a single landmass, fossils matched on continents that fit together, and climates were similar.

Question of the Day Question: How do we know that continents move? Answer: ……… Turn In: Label the Earth Worksheet (blue)

Earth in Motion. Principle of Uniformitarianism: Processes observable and measurable today have created all the geological features, over long periods.

Plate Tectonics.

Evidence for Continental Drift

If you look at a map of the world, you may notice that some of the continents could fit together like pieces of a puzzle…..the shapes of the coastlines.

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

The Earth’s Structure & Plate Tectonics. The Earth’s Interior Composed of 4 layers –Crust –Mantle –Outer Core –Inner Core.

What type of boundary is represented here?

Chapter 17 Plate Tectonics. Structure of the Earth Earth.

 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.

What is Plate Tectonics Theory? Use this part of the PPT for p. 7 of your INB!!!

Daily Review #3 8. Tell the rock’s story… Composition of Earth 3 layers ◦ Based on compounds present ◦ Density differences Crust ◦ Outermost ◦

 Composition: Silicon, Oxygen, and Aluminum  Types: › Continental Crust: solid & rocky outer layer › Oceanic Crust: thin & dense material.

Plate Tectonics Wrap-Up

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.

Continental Drift The Beginning of Plate Tectonics.

The Birth of a Theory: Continental Drift. Throughout history, most people believed that the continents had always been in the same positions that they.

Plates of the Lithosphere. Pangaea – Giant supercontinent of the Paleozoic and Mesozoic eras Continental Drift – The breakup of Pangaea where plates moved.

12.1 Evidence for Continental Drift

Layers of the Earth & Ocean Basins Origin & Structure Ch.2 The Sea Floor.

Continental Drift. Note the Shapes South America & Africa: They Match! What about any others? North America?

Tectonic Jeopardy!. Tectonic Jeopardy! Earth’s Layers Heat Transfer Continental Drift Sea-Floor Spreading Plate Tectonics

Pg. 47/48 Plate Tectonics. Pangaea Continental drift caused the supercontinent Pangaea to separate Pangaea -Greek word meaning ‘all the earth’; most recent.

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

Continental Drift, Seafloor Spreading & Plate Tectonics

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.

Evidence for Plate Tectonics

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

Plate Tectonics 8 th Grade Science. Earth’s Composition.

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.

Geology of the Ocean. Origin of Earth 4.6 billion years ago began as giant disk of dust and gases orbiting the sun grains came together forming comets,

Warm-Up 1.If a bone specimen contains 12.5% of its original amount of Carbon-14, how many half lives have passed? 2.How old if the bone? Time’s Up!

Plate Tectonics.

The Theory of Plate Tectonics The Earth’s crust is broken up into plates which move around on top of the mantle **Driven by convection currents**

INSIDE THE EARTH REVIEW COMPLIMENTS OF MS. SINGLETON.

Evidence for Plate Tectonics

Plate Tectonics. Outline  Pangaea  Continental Drift  Mid-ocean ridges and seafloor spreading  Magnetic patterns on the seafloor  Plate tectonics:

Chapter 10 Plate Tectonics. Continental Drift One scientist who looked at the continents as pieces of a puzzle was Alfred Wegener. He was the first to.

Science 7: Unit E: Planet Earth Topic 4 – The Moving Crust.

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:

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

PART 1: The Theory of Continental Drift is a hypothesis that states the continents once formed a large, single landmass called Pangaea.

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.

CHAPTER 17 PLATE TECTONICS. I. Continental Drift A. Theory 1. the continents are continually moving around the Earth 2. Caused by forces deep within the.

Plate Tectonics 8 th Grade Science. Earth’s Composition.

Lesson 1: The Continental Drift Hypothesis

Plate Tectonics A Whole Lot of Shakin’ Goin’ On. Layers of the Earth - Review Crust Mantle Outer core Inner core

Warm-up Why are there earthquakes and volcanoes ? What do you think causes it?

Science 10 Chp 12 Plate Tectonics.

Continental Drift Alfred Wegner’s theory

CONTINENTAL DRIFT AND PLATE TECTONICS

Plate Tectonics.

Ch. 17 Plate Tectonics Are land masses actually moving?

Ch. 17 Plate Tectonics Are land masses actually moving?

Chapter 10 Plate Tectonics.

The Origin of Ocean Basins

12.1 Evidence for Continental Drift

12.1 Evidence for Continental Drift

12.1 Evidence for Continental Drift

Continental Drift and Plate Tectonics

Presentation transcript:

Honors 1360 Planet Earth Last time: Leading Up to Plate Tectonics… Obs : Mountain mass balanced by deep buoyancy Hyp : “Solid” rock flows on long time scales Obs : “Jigsaw Puzzle” fit of continental boundaries Obs : Paleoclimate: Fossils, glacial striae at wrong latitudes Obs : Similar mountain ranges, rock formations, fossils on either side of the Atlantic Hyp : Continental Drift: Continents once were one large supercontinent (Pangea) & drifted to current locations Obs : Ocean Bathymetry Hyp : ??? Today: Plate Tectonics Cont’d: A Paradigm Shift 15 September 2008

Earth in the News… Unusually long “earthquakes” are actually “icequakes” in actively moving glaciers… Greenland icequakes show significantly increasing frequency in the past three summers. September 2008 “Physics Today”

Then (ca. 1950’s) came the Cold War… Measured Ocean Bathymetry to facilitate submarine warfare; discovered mid-ocean ridges, trenches, and fracture zones

As part of an ultimately fruitless attempt to use magnetism to search for subs, measured Seafloor Magnetic Lineations These were found to be Symmetric Across Ridges! Now Here’s a Puzzle…

To understand, needed two pieces of information from continental studies of rock magnetism: (1) Rocks acquire the ambient magnetic field direction as they cool through the Curie temperature (called remanant magnetization) (2) Magnetic dipole direction occasional Reverses

Magnetic Lineations (Symmetric Across Ridges!) Magnetite in basalt records field direction when solidified Field direction changes! Ocean floor slowly moves away from ridges “Seafloor Spreading” Testable Predictions?

Age of the Ocean Floor Drilled/dredged rocks from seafloor and age-dated them!

Question: Why Are There Ridges Where The Ocean Is Youngest?

Wikipedia:

WRONG! Never trust a Wiki…. Ocean crust is ~ constant 6 km thickness! Always remember foundations of CRITICAL THINKING :  Use multiple sources of information  Evaluate the reliability of sources  Think about what makes sense!

Recall thermal expansion & thermal contraction? Hot Rock Cool Rock fast seismic velocity slow seismic velocity