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Chapter 10, Section 2 Chapter 10, Section 2 Objective 1

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Presentation on theme: "Chapter 10, Section 2 Chapter 10, Section 2 Objective 1"— Presentation transcript:

1 Chapter 10, Section 2 Chapter 10, Section 2 Objective 1
Standards 3b. Students know the principal structures that form at the 3 different kinds of plate boundaries. Objective 1 Summarize the theory of plate tectonics. Objective 2 Identify and describe the 3 types of plate boundaries. Objective 3 List and describe 3 causes of plate movement. Assessment Flap Book, Chapter Test Review Daily Bellwork, Science Starters, Standards Practice Chapter 10, Section 2 Movie on the Rock Cycle??

2 Key Terms Create a flashcard for each of the following terms (found on p.247 in your text book). Plate tectonics Lithosphere Asthenosphere If you finish early, study your flashcards!

3 Plate Tectonics The theory of Continental Drift led to the theory of PLATE TECTONICS. PLATE TECTONICS explains how large pieces of the lithosphere, called plates, move and change shape. Earth’s crust and the rigid, upper part of the mantle = LITHOSPHERE. This is the thin outer shell of Earth (like an Egg shell). The lithosphere is broken into several pieces called TECTONIC PLATES. The TECTONIC PLATES ride or float on the ATHENOSPHERE (part of the Earth’s mantle that is flowing slowly).

4 Earth’s Crust OCEANIC CRUST = dense, made of iron and magnesium-rich rock. CONTINENTAL CRUST = low density, made of rock rich in silica. Both kinds of crust are always moving with the tectonic plates they are riding on.

5 Tectonic Plates 15 major tectonic plates.

6 Earthquakes and Volcanoes
Frequent earthquakes in an area are evidence the 2 or more tectonic plates meet in that area. Many volcanoes form from plate motion and help scientist identify plate boundaries.

7 Quick Check!! The upper and hard part of the Earth’s mantle is called the ______________________. The two types of crust are continental and ____________. Scientists have identified about ______ major tectonic plates. Name one plate: _________________________________________________________________________________________________________________________________________________________________________________

8 Types of Plate Boundaries
Most of the dramatic changes in Earth’s crust---Volcanoes and Earthquakes---occur at Plate Boundaries. Divergent Convergent Transform

9 Divergent Boundaries 2 plates move away from each other.
Magma from the athenosphere rises to the surface as the 2 plates move apart, the magma cools and creates new oceanic lithosphere(sea-floor spreading).

10 Convergent Boundary 2 plates collide 3 types of Collisions

11 Types of Collisions Oceanic Lithosphere vs. Continental
Oceanic is denser so it sinks under the continental lithosphere Called a SUBDUCTION ZONE Deep-ocean trenches and Volcanoes form at SUBDUCTION ZONES Continental vs. Continental Lithosphere Neither plate subducts Colliding edges crumple and thicken causing uplift that forms large mountain ranges. Oceanic vs. Oceanic Lithosphere One plate subducts under the other Deep ocean trench forms Magma rises to form and ISLAND ARC, or chain of Volcanic Islands

12 Transform Boundaries 2 plates slide past each other horizontally
The edges of the plates scrape and jolt along each other. This motion is felt as Earthquakes. No Magma is produced

13 Summary—Plate Boundaries
Divergent Plates moving away from each other to form rifts and mid-ocean ridges North American and Eurasian plates at the Mid-Atlantic Ridge. Red Sea. Convergent Plates moving toward each other and colliding to form ocean trenches, mountain ranges, volcanoes, and island arcs South American and Nazca plates at the Chilean trench along the west coast of South America. Himalyan mountains, Japan. Transform Plates sliding past each other while moving in opposite directions North American and Pacific Plates at the San Andreas fault in California.

14 Quick Check!! Name the 3 types of plate boundaries: ____________________________________________________________________________________________________________ San Andreas fault is an example of a _________ boundary. 2 plates moving apart is a _________ boundary. Mid-Atlantic Ridge is causing South America and _______ to spread apart.

15 Mantle Convection Ridge Push Slab Pull Causes of Plate Motion

16 Mantle Convection Heat from the Earth’s core heats the material in the Mantle. The heated material expands and becomes less dense therefore rising around the cooler, denser material above it. This cycle continues, this is called CONVECTION. Convection currents cause the tectonic plates above it to move. C

17 Plate Tectonics Animation

18 Plate Tectonics Video Clip

19 Tectonic Plate Boundary Activity
In your group you will create each of the 3 plate boundaries using modeling clay. p. 253 quick lab and/or modeling activity pdf file uner Ch. 10 folder. Take pics of finished models? Print and have students label?

20 Assessment Make a 3-Flap Book showing each of the types of plate boundaries. For each flap include: --Definition/Description --Drawing --Real World Example

21 Daily Quiz Put into Responders and/or project using SMART notebook. 3 Questions a day. Oral and on small papers??

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