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Warm Up 5/10/07

Warm Up 5/10/07. Which of the following best describes California’s water supply? a. most of the state’s water needs are met with groundwater b. most of the state’s water needs are met by removing the salt from seawater

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Warm Up 5/10/07

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  1. Warm Up 5/10/07 • Which of the following best describes California’s water supply? a. most of the state’s water needs are met with groundwater b. most of the state’s water needs are met by removing the salt from seawater c. there is more fresh water in the southern part of the state than in the northern part d. there is more fresh water in the northern part of the state than the southern part • The part of a water project that carries fresh water to where it is needed is a(n) a. reservoir c. desalination plant b. hydroelectric plant d. aqueduct • Most of the fresh water used in California is used a. in homes c. for recreation b. in offices d. for agriculture Answers: 1) d. 2) d. 3) d.

  2. California’s Natural Hazards Chapter 13A, Section 3

  3. California’s Earthquake Hazards • Natural Hazard – an event that results from Earth processes and that can cause damage and endanger human life • Natural hazards that result from California’s earthquakes include tsunamis, seismic shaking, liquefaction, and landslides • Scientists have evidence that in the past 200 years, more than a dozen locally generated tsunamis have struck the CA coastline • Seismic Shaking – measure of how much ground movement occurs during a quake • The amount of shaking depends on the rock and soil location of an area • Modified Mercalli Scale – describes the effects of seismic shaking • Earthquakes in CA can also cause liquefaction and landslides, collapsing and damaging homes

  4. West Coast Tsunami Warning System

  5. Earthquake Hazards

  6. Earthquake Hazards

  7. California’s Volcanic Hazards • Natural Hazards from volcanic eruptions in California include volcanic ash, lava flows, and volcanic gases • The Cascade Range stretches from Washington into northern CA • Cascade volcanoes in CA include: Black Butte, Mount Shasta, Medicine Lake Volcano, and Lassen Peak • The two volcanoes that are classified as active are Mount Shasta (late 1700s) and Lassen Peak (early 1900s) • Volcanic Field – an area covered by volcanic rocks • The Long Valley Caldera is the focus of a large volcanic field on the eastern side of the Sierra Nevada (some rocks are only a few hundred years old!) • Carbon dioxide escaping from the ground beneath Mammoth Mountain is killing trees in the area

  8. Long Valley Caldera

  9. California’s Storm Hazards • Two main storm-related hazards in California are mudflows and flooding • The dry conditions in southern CA make it very susceptible to mudflows and flooding, especially when precipitation is greater than normal • A mudflow is a mass of very wet soil, and sometimes rock, that flows quickly downhill • At top speed, a mudflow can move nearly 60 km/hour, destroying everything in its path • Flash floods occur in mountains and deserts; they can be deadly because the floodwaters rise rapidly and move quickly

  10. Mudflows and Flooding

  11. Assignment • Read Chapter 13A, Section 3 (pg. CA 20-CA 26) • Do Section 13A.3 Assessment #1-6 (pg. CA 26) • Study for Chapter 13A Quiz!

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