NATURAL DISASTERSNATURAL DISASTERS

The causes and effects The causes and effects ANDAND

How equilibrium, and potential and kinetic How equilibrium, and potential and kinetic energy of an environment are affectedenergy of an environment are affected

Pictures and links provided by FEMAPictures and links provided by FEMA

Which of the following can Which of the following can happen in New York State?happen in New York State?

tornadoestornadoes hurricaneshurricanes floods or droughtsfloods or droughts forest firesforest fires earthquakesearthquakes volcanoesvolcanoes tsunamistsunamis severe thunderstorms or lightningsevere thunderstorms or lightning blizzards or avalanchesblizzards or avalanches

The world is always changing.The world is always changing.

Natural disasters are changes to the environment that are so great they may cause changes to the shape of the land, destruction of property, or affect the lives of people and other living things.

The Earth is dynamic. Great changes occur deep inside the Earth and on its surface each day. The changes that occur on the outer part of the Earth, such as floods or tornadoes, happen because of different kinds of weather conditions; specifically, severe changes in the weather.

HURRICANES and HURRICANES and TORNADOESTORNADOES

Hurricanes and tornadoes are fierce storms that cover large areas with strong winds from 74 - 250+ mph that spin counterclockwise. During these deadly storms, trees can be uprooted, buildings destroyed, cars overturned, power lines downed, and lives can be lost. Hurricanes are extremely dangerous because of high winds and flooding.

TSUNAMISTSUNAMISA tsunami is a giant sea wave that crosses the A tsunami is a giant sea wave that crosses the ocean toward land building in size and strength ocean toward land building in size and strength as it gains energy. Tsunamis occur as a result of as it gains energy. Tsunamis occur as a result of movement caused by the Earth, either from an movement caused by the Earth, either from an earthquake or a landslide. When the tsunami earthquake or a landslide. When the tsunami reaches the coast, it is highly destructive because reaches the coast, it is highly destructive because of the huge size of the waves, which can be over of the huge size of the waves, which can be over 100 feet high, and the severe flooding it causes. 100 feet high, and the severe flooding it causes. Tsunamis are extremely dangerous and deadly.Tsunamis are extremely dangerous and deadly.

Japanese tsunami caused by earthquake (March 2011)Japanese tsunami caused by earthquake (March 2011)

TORNADOESTORNADOES Found mainly in the Found mainly in the

mid-west plains area of mid-west plains area of the U.S. known as the U.S. known as Tornado Alley Tornado Alley

HURRICANESHURRICANES Hurricanes are found Hurricanes are found

mostly along coastal mostly along coastal areas where warm areas where warm ocean currents travel ocean currents travel westward across the westward across the Atlantic Ocean toward Atlantic Ocean toward the East coast.the East coast.

A flood is caused by an overflow of water which covers land that is usually either too dry and rainwater cannot penetrate the ground because it is too hard or because the ground is already saturated with water from too much rain so it causes runoff flood water.

Floods often occur in the Spring due to heavy rain or is caused by snow melting and the rivers burst their banks and overflow.

Costal floods are caused by high tides, a rise in sea level, storm waves or a tsunami.

FLOODSFLOODS

FLOODS FLOODS

Major flooding occurs in low lying areas or where Major flooding occurs in low lying areas or where major rain events can occurmajor rain events can occur

FOREST FIRES (WILD FIRES)FOREST FIRES (WILD FIRES)

Wild fires are Wild fires are common in dry common in dry places with places with numerous forests numerous forests and little rainand little rain

DROUGHTDROUGHTA drought is the lack of rain for a long time.

In 1968, a severe drought began in Africa. Children born during that year were five years old before rain fell again.

FOREST FIRESFOREST FIRES (WILD FIRES) (WILD FIRES)

Fires can quickly burn wildly out of control in dry areas of forest. Fires are caused by lightning, sparks of electricity or careless people. Strong winds may blow a forest fire to areas where people live. Once the area has been destroyed by fire, without the vegetation to hold the soil in place, the area is susceptible to massive landslides or mudslides.

EARTHQUAKESEARTHQUAKES An earthquake is a violent shaking of the ground. An earthquake is a violent shaking of the ground.

Sometimes it is so strong that the ground splits apart.Sometimes it is so strong that the ground splits apart.

When parts of the Earth, called tectonic plates, interact When parts of the Earth, called tectonic plates, interact with each other giant shock waves move upwards towards with each other giant shock waves move upwards towards the surface causing the earthquake.the surface causing the earthquake.

The area on the surface of the Earth where the most The area on the surface of the Earth where the most damage occurs is called the epicenter.damage occurs is called the epicenter.

DUCK, COVER, HOLD!DUCK, COVER, HOLD!

EARTHQUAKESEARTHQUAKES Earthquakes Earthquakes

are mainly are mainly found along found along fault line fault line boundaries boundaries such as the such as the west coast west coast where North where North America once America once separated from separated from the super the super landmass landmass called Pangeacalled Pangea

SAN ANDREAS FAULTSAN ANDREAS FAULTCaliforniaCalifornia

VOLCANOESVOLCANOES A volcanic eruption is the spurting out of A volcanic eruption is the spurting out of

gases and hot lava from the asthenosphere gases and hot lava from the asthenosphere through an opening in the Earth’s crust.through an opening in the Earth’s crust.

Pressure from deep inside the Earth forces Pressure from deep inside the Earth forces ash, gas and molten rock to the surface.ash, gas and molten rock to the surface.

Some volcanic eruptions are explosive Some volcanic eruptions are explosive such as Mount St. Helens.such as Mount St. Helens.

VOLCANOESVOLCANOES

Active volcanoes in the Active volcanoes in the U.S. are found mainly in U.S. are found mainly in the area of the Ring of the area of the Ring of Fire, which includes the Fire, which includes the states of Hawaii, Alaska, states of Hawaii, Alaska, Oregon, California, and Oregon, California, and Washington. The Washington. The greatest chance of greatest chance of eruptions occur near eruptions occur near areas where many areas where many people live such as people live such as Hawaii and Alaska. Hawaii and Alaska.

SEVERE THUNDERSTORMS SEVERE THUNDERSTORMS AND LIGHTNINGAND LIGHTNING

Thunderstorms are most likely to occur in the spring and Thunderstorms are most likely to occur in the spring and summer months and during the afternoon and evening hours, summer months and during the afternoon and evening hours, but they can occur year-round and at all hours of the day or but they can occur year-round and at all hours of the day or night. Along the Gulf Coast and across the southeastern and night. Along the Gulf Coast and across the southeastern and western U.S., most thunderstorms occur during the afternoon. western U.S., most thunderstorms occur during the afternoon. Thunderstorms often occur in the late afternoon and at night in Thunderstorms often occur in the late afternoon and at night in the central U.S. Florida has the most lightning strikes.the central U.S. Florida has the most lightning strikes.

BLIZZARDSBLIZZARDSBlizzards can happen in NYS because of weather conditions known as lake effect snow. When cold arctic air meets the warmer waters in the large lakes in central NYS, conditions are ideal for the formation of lake effect snow. If the snow fall continues for long periods of time and is accompanied by severe winds, a blizzard may develop. Blizzards can be deadly because the strong winds can cause hazardous road conditions such as “white-outs” or “black ice”, and knock down trees and power lines, causing homes to be without heat and power for days.

AVALANCHESAVALANCHESAn avalanche is a rapid movement of snow, ice and rock down a mountainside. Avalanches happen very suddenly and can move as fast as a racing car up to 124mph.

Avalanches can be caused by –

• snow melting quickly

• snow freezing, melting then freezing again

• someone skiing

• a loud noise or an Earth tremor

LANDSLIDESLANDSLIDES

The Tully Valley landslide that occurred onThe Tully Valley landslide that occurred on

April 27, 1993, just south of Syracuse, New York, April 27, 1993, just south of Syracuse, New York, is considered one of the worst natural disasters in is considered one of the worst natural disasters in U.S. history. This natural disaster fortunately did U.S. history. This natural disaster fortunately did not cause any loss of life, but caused much not cause any loss of life, but caused much destruction to property and loss of many homes destruction to property and loss of many homes in the area.in the area.

The massive rock slide down the mountainside The massive rock slide down the mountainside lasted less than an hour, covered roadways with lasted less than an hour, covered roadways with mud 15 feet deep, and people had to be rescued mud 15 feet deep, and people had to be rescued by helicopter from the rooftops of their homes.by helicopter from the rooftops of their homes.

Tully Valley landslide (April 27, 1993)Tully Valley landslide (April 27, 1993)

HOW THE ENVIRONMENT AND HOW THE ENVIRONMENT AND LIVES ARE AFFECTED BY LIVES ARE AFFECTED BY

NATURAL DISASTERSNATURAL DISASTERS Natural Disasters are events that occur Natural Disasters are events that occur

naturally on the Earth. They affect the naturally on the Earth. They affect the characteristics of the environment and living characteristics of the environment and living things, and have ultimately influenced the things, and have ultimately influenced the history of the world. history of the world.

During a natural disaster, potential energy During a natural disaster, potential energy becomes kinetic energy and alters the becomes kinetic energy and alters the equilibrium in the environment. equilibrium in the environment.

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