Warm UpWarm Up1)1) The part of a The part of a water projectwater project that that carries carries (moves)(moves)

fresh waterfresh water to where it is needed is a(n) to where it is needed is a(n)a. hydroelectric plant.a. hydroelectric plant. c. desalination plant.c. desalination plant.b. aqueduct.b. aqueduct. d. reservoir.d. reservoir.

2)2) MostMost of the of the fresh waterfresh water in California is in California is useduseda. in offices.a. in offices. c. for recreation.c. for recreation.b. for agriculture.b. for agriculture. d. in homes.d. in homes.

3)3) A major A major source of water source of water for southern California is for southern California is a. San Francisco Bay.a. San Francisco Bay. c. the Colorado River.c. the Colorado River.b. the Klamath River.b. the Klamath River. d. Lake Tahoe.d. Lake Tahoe.

Answers: 1) b. 2) b. 3) c.Answers: 1) b. 2) b. 3) c.

California’s California’s Natural HazardsNatural Hazards

Chapter 13A, Section 3Chapter 13A, Section 3

California’s Earthquake California’s Earthquake HazardsHazards Natural Hazard –Natural Hazard – an event that results from Earth an event that results from Earth

processes and that can cause damage and endanger processes and that can cause damage and endanger human lifehuman life

Natural hazards that result from California’s Natural hazards that result from California’s earthquakes include tsunamis, seismic shaking, earthquakes include tsunamis, seismic shaking, liquefaction, and landslidesliquefaction, and landslides

Scientists have evidence that in the past 200 years, Scientists have evidence that in the past 200 years, more than a dozen locally generated tsunamis have more than a dozen locally generated tsunamis have struck the CA coastlinestruck the CA coastline

Seismic Shaking –Seismic Shaking – measure of how much ground measure of how much ground movement occurs during a quakemovement occurs during a quake

The amount of shaking depends on the rock and soil The amount of shaking depends on the rock and soil location of an arealocation of an area

Modified Mercalli Scale –Modified Mercalli Scale – describes the effects of describes the effects of seismic shakingseismic shaking

Earthquakes in CA can also cause liquefaction and Earthquakes in CA can also cause liquefaction and landslides, collapsing and damaging homeslandslides, collapsing and damaging homes

West Coast Tsunami Warning West Coast Tsunami Warning SystemSystem

Earthquake HazardsEarthquake Hazards

Earthquake HazardsEarthquake Hazards

Concept CheckConcept Check Where are landslides due to seismic Where are landslides due to seismic

shaking most likely to occur?shaking most likely to occur? They are most likely to occur on They are most likely to occur on

steep slopes or in areas underlain by steep slopes or in areas underlain by weak soils.weak soils.

California’s Volcanic California’s Volcanic HazardsHazards

Natural Hazards from volcanic eruptions in California Natural Hazards from volcanic eruptions in California include volcanic ash, lava flows, and volcanic gasesinclude volcanic ash, lava flows, and volcanic gases

The Cascade Range stretches from Washington into The Cascade Range stretches from Washington into northern CAnorthern CA

Cascade volcanoes in CA include: Black Butte, Mount Cascade volcanoes in CA include: Black Butte, Mount Shasta, Medicine Lake Volcano, and Lassen PeakShasta, Medicine Lake Volcano, and Lassen Peak

The two volcanoes that are classified as active are The two volcanoes that are classified as active are Mount Shasta (late 1700s) and Lassen Peak (early Mount Shasta (late 1700s) and Lassen Peak (early 1900s)1900s)

Volcanic Field –Volcanic Field – an area covered by volcanic rocks an area covered by volcanic rocks The Long Valley Caldera is the focus of a large The Long Valley Caldera is the focus of a large

volcanic field on the eastern side of the Sierra Nevada volcanic field on the eastern side of the Sierra Nevada (some rocks are only a few hundred years old!)(some rocks are only a few hundred years old!)

Carbon dioxide escaping from the ground beneath Carbon dioxide escaping from the ground beneath Mammoth Mountain is killing trees in the areaMammoth Mountain is killing trees in the area

Mount Shasta

Lassen Peak

Long Valley Long Valley CalderaCaldera

Concept CheckConcept Check What is a volcanic field?What is a volcanic field? A volcanic field is an area that is A volcanic field is an area that is

covered by volcanic rocks.covered by volcanic rocks.

California’s Storm California’s Storm HazardsHazards

Two main storm-related hazards in California Two main storm-related hazards in California are mudflows and floodingare mudflows and flooding

The dry conditions in southern CA make it The dry conditions in southern CA make it very susceptible to mudflows and flooding, very susceptible to mudflows and flooding, especially when precipitation is greater than especially when precipitation is greater than normalnormal

A mudflow is a mass of very wet soil, and A mudflow is a mass of very wet soil, and sometimes rock, that flows quickly downhillsometimes rock, that flows quickly downhill

At top speed, a mudflow can move nearly 60 At top speed, a mudflow can move nearly 60 km/hour, destroying everything in its pathkm/hour, destroying everything in its path

Flash floods occur in mountains and deserts; Flash floods occur in mountains and deserts; they can be deadly because the floodwaters they can be deadly because the floodwaters rise rapidly and move quicklyrise rapidly and move quickly

Mudflows and FloodingMudflows and Flooding

AssignmentAssignment Read Chapter 13A, Section 3 (pg. CA Read Chapter 13A, Section 3 (pg. CA

20-CA 26)20-CA 26) Do Chapter 13A Assessment #1-33 Do Chapter 13A Assessment #1-33

(pg. CA 31-CA 32(pg. CA 31-CA 32 For Section 3: Do #’s 8-10, 20-23, For Section 3: Do #’s 8-10, 20-23,

27-31, 3327-31, 33 Study for the Unit Test (Ch. 12-13A)Study for the Unit Test (Ch. 12-13A)