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Miss Nelson SCIENCE ~ CHAPTER 6 VOLCANOES. California Geology SECTION 4.

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Presentation on theme: "Miss Nelson SCIENCE ~ CHAPTER 6 VOLCANOES. California Geology SECTION 4."— Presentation transcript:

1 Miss Nelson SCIENCE ~ CHAPTER 6 VOLCANOES

2 California Geology SECTION 4

3 Recall the types of movements that occur along each of the three major types of tectonic plate boundaries (chapter 4). ANTICIPATORY SET

4 S 6.1.f – Students know how to explain major features of California geology in terms of plate tectonics STANDARDS

5 How does plate tectonics help to explain features of California’s geology? THE BIG IDEA

6  Basin – a broad, bowl-shaped valley formed where the crust is bent downward  Central Valley – the large basin in California between the Coast Ranges and the Sierra Nevada KEY TERMS

7 Read “California Geology” on page 235 of your textbook CALIFORNIA GEOLOGY

8 The movement of the Pacific and North American plates produce California’s major geological features:  Faults  Volcanoes  Mountain ranges  Basins PLATE TECTONICS AND CALIFORNIA

9  Faults are often found along or near the boundaries of plates  The Pacific and North American plates slide past each other along the San Andreas fault FAULTS

10  In the Pacific Ocean the Juan de Fuca plate is being subducted beneath the North American plate  Mount Shasta and Lassen Peak in northern California are volcanoes that resulted from this process VOLCANOES

11  Plate motion provides the force that pushed up California’s mountains  The Sierra Nevada began to form several million years ago as plate movements pushed up a batholith  Plate motions folded the crust to push up the northern Coast Ranges  The Transverse Ranges formed as plate motions rotated a block of crust and squeezed it upward MOUNTAIN RANGES

12  Plate movements sometimes cause the crust to warp, or bend, downward  The result is a basin  Millions of years ago, some of California’s basins slowly sank below sea level  Later, plate motions pushed the crust above sea level again BASINS

13 What four features of California geology does plate tectonics explain? How does the San Andreas fault help to explain why there are so many other faults in California? CHECK FOR UNDERSTANDING

14 What four features of California geology does plate tectonics explain? The four features of California geology explain by plate tectonics are faults, volcanoes, mountain ranges, and basins. How does the San Andreas fault help to explain why there are so many other faults in California? The San Andreas fault explains the other faults in California because movement along the main fault causes rocks to be pulled and pushed by enormous forces, which cause them to break. CHECK FOR UNDERSTANDING

15 Los Angeles lies on the Pacific plate. San Jose lies on the North American plate. How will the distance between the two cities change over millions of years? GUIDED PRACTICE

16 Los Angeles lies on the Pacific plate. San Jose lies on the North American plate. How will the distance between the two cities change over millions of years? Over millions of years the distance between Los Angeles and San Jose will increase as the Pacific plate moves northwest relative to the North American plate. GUIDED PRACTICE

17 Complete Volcanoes 6-4 Independent Practice INDEPENDENT PRACTICE


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