Mr. Petersen EARTH SCIENCE LESSON th Grade

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1 Teacher Prep Materials and stuff needed: Cutout Glue Sticks or Rice Glue PowerPoint Plate Tectonics Set up the students for taking notes. Model for the students using the camera projector. Use the Prentice Hall PowerPoint Plate Tectonics While the students are taking the notes let them cut out the pictures and glue them on their notes. Take a Stretch Break No Time to Show Video Show it in lesson 22 * Bill Nye Tape 15 Earthquakes Plate Tectonics 1:40

2 Mr. Petersen EARTH SCIENCE LESSON 55 9 th Grade

3 Self Starter * Lesson 55 Date: 11/30/2014 Today s Learning Objective: Students will learn how Alfred Wegener s Continental Drift Theory changed and then was called the Plate Tectonics theory. Constructive Response Question: Who was Alfred Wegener? Answer: Answers will vary. Homework: Nothing

4 Glossary Portfolio 4 [ 1] Make sure you number and underline each Glossary word and write out the whole definition. Students who don t write the whole definition will lose 10 points off the top of their Portfolio Score. 1. Convection- 2. Conduction- 3. Alfred Wegener- 4. Continental Drift- 5. Plate Tectonics- 6. Pangaea-

5 Assignment Number Assignment Log Portfolio 4 Assignment Title Lesson Number 1 Glossary List 49 2 Earth Layer Information Table 48 3 Constructive Response Questions 49 & 50 4 Important Points Cutout Assignment 55 &

6 Seven Step Process Continental Drift Word in science book context: German scientist Alfred Wegener formed this idea of Continental Drift. He argued that todays continents once formed a single landmass, which he named Pangaea (Greek for "all land"). It broke into pieces due to the weaknesses in the earth's crust as they were made up of less dense materials, which drifted centimeter by centimeter over millions of years until they arrived at where they are now.

7 Dictionary Definition: Continental drift is the movement of the Earth's continents relative to each other.

8 Student Teacher Friendly Definition: Over billions and billions of years the Continents have been drifting around the earth. Alfred Wegener didn t know the mechanism that caused this movement of the continents.

9 Watch Video: 1:37

10 Plate Tectonics is the new theory. With Continental Drift they didn t understand the mechanism that caused the movement. With Plate Tectonics now they do understand what causes the continents to drift.

11 Lesson 55 Directions Use a blank sheet of lined paper. Build a box in the upper right hand corner & put the number 4 in the box. Write the sentences points that are in the blue colored font. Pass out the Cut and Paste Pictures, Glue and Scissors. Please listen and think about what Mr. Petersen is saying during this lesson.

12 Lesson 55 Plate Tectonics

13 9.1 Continental Drift An Idea Before Its Time Wegener s continental drift hypothesis stated that the continents had once been joined to form a single supercontinent. (Write this information on your important points paper: 1. Wegener proposed that the supercontinent, Pangaea, began to break apart 200 million years ago and form the present landmasses. (Cut out the picture #1 of Alfred Wegener. Rice Glue it to your papers by #1)

14 Breakup of Pangaea

15 9.1 Continental Drift An Idea Before Its Time Evidence The Continental Puzzle Matching Fossils 2. Fossil evidence for continental drift includes several fossil organisms found on different landmasses. (Cut out Picture #2 and glue it to your papers.)

16 9.1 Continental Drift An Idea Before Its Time Evidence Rock Types and Structures - Rock evidence for continental exists in the form of several mountain belts that end at one coastline, only to reappear on a landmass across the ocean. Ancient Climates

17 Matching Mountain Ranges

18 Glacier Evidence

19 9.1 Continental Drift Rejecting the Hypothesis A New Theory Emerges 3. Wegener could not provide an explanation of exactly what made the continents move. New technology lead to findings which then lead to a new theory called plate tectonics. (No Picture)

20 9.2 Plate Tectonics Earth s Major Roles According to the plate tectonics theory, the uppermost mantle, along with the overlying crust, behaves as a strong, rigid layer. This layer is known as the lithosphere. A plate is one of numerous rigid sections of the lithosphere that move as a unit over the material of the asthenosphere.

21 9.2 Plate Tectonics Types of Plate Boundaries Divergent boundaries (also called spreading centers) are the place where two plates move apart. Convergent boundaries form where two plates move together. Transform fault boundaries are margins where two plates grind past each other without the production or destruction of the lithosphere.

22 Three Types of Plate Boundaries

23 9.3 Actions at Plate Boundaries Divergent Boundaries Oceanic Ridges and Seafloor Spreading Oceanic ridges are continuous elevated zones on the floor of all major ocean basins. The rifts at the crest of ridges represent divergent plate boundaries. Rift valleys are deep faulted structures found along the axes of divergent plate boundaries. They can develop on the seafloor or on land. 4. Seafloor spreading produces new oceanic lithosphere. (Cut out Divergent boundary picture #4 glue it to your important points paper.)

24 Spreading Center

25 9.3 Actions at Plate Boundaries Divergent Boundaries Continental Rifts When spreading centers develop within a continent, the landmass may split into two or more smaller segments, forming a rift.

26 East African Rift Valley

27 9.3 Actions at Plate Boundaries Convergent Boundaries 5. A subduction zone occurs when one oceanic plate is forced down into the mantle beneath a second plate. (Picture 5) Oceanic-Continental Denser oceanic slab sinks into the asthenosphere. Pockets of magma develop and rise. Continental volcanic arcs form in part by volcanic activity caused by the subduction of oceanic lithosphere beneath a continent. Examples include the Andes, Cascades, and the Sierra Nevadas.

28 Finish this Assignment Tomorrow

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