Science ~ chapter 6 volcanoes

1. Science ~ chapter 6volcanoes Miss Nelson

2. Section 4 California Geology

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

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

5. The big idea How does plate tectonics help to explain features of California’s geology?

6. Key terms • 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

7. California geology Read “California Geology” on page 235 of your textbook

8. Plate tectonics and california The movement of the Pacific and North American plates produce California’s major geological features: • Faults • Volcanoes • Mountain ranges • Basins

9. faults • 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

10. volcanoes • 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

11. Mountain ranges • 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

12. basins • 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

13. Check for understanding 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?

14. Check for understanding 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.

15. Guided practice 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?

16. Guided practice 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.

17. Independent practice Complete Volcanoes 6-4 Independent Practice