Presentation 27

Slide 1: 

INCREASING NATURAL DISATERS

NATURAL DISATERS : 

NATURAL DISATERS EARTHQUAKE FLOOD HURRICANE TSUNAMI VOLCANO TORNADOES

EARTHQUAKES : 

EARTHQUAKES Earthquake, shaking of the Earth’s surface caused by rapid movement of the Earth’s rocky outer layer. Earthquakes occur when energy stored within the Earth, usually in the form of strain in rocks, suddenly releases. Human activities can also be the direct or indirect cause of significant earthquakes. Injecting fluid into deep wells for waste disposal, filling reservoirs with water, and firing underground nuclear test blasts can, in limited circumstances, lead to earthquakes. These activities increase the strain within the rock near the location of the activity so that rock slips and slides along pre-existing faults more easily. Most earthquakes are caused by the sudden slip along geologic faults. The faults slip because of movement of the Earth’s tectonic plates.The rocky tectonic plates move very slowly, floating on top of a weaker rocky layer. As the plates collide with each other or slide past each other, pressure builds up within the rocky crust. Earthquakes occur when pressure within the crust increases slowly over hundreds of years and finally exceeds the strength of the rocks.

Slide 4: 

OCCURRENCE OF EARTHQUAKES AT VARIOS PLACES HAD CAUSED UNREPAIRABLE DESTRUCTION .SOMETIMES THEY HAVE DESTROYED EVEN CITIES.

FLOODS : 

FLOODS When it rains or snows, some of the water is retained by the soil, some is absorbed by vegetation, some evaporates, and the remainder, which reaches stream channels, is called runoff. Floods occur when soil and vegetation cannot absorb all the water; water then runs off the land in quantities that cannot be carried in stream channels or retained in natural ponds and constructed reservoirs. About 30 percent of all precipitation is runoff, and this amount may be increased by melting snow masses. Periodic floods occur naturally on many rivers, forming an area known as the flood plain. These river floods often result from heavy rain, sometimes combined with melting snow, which causes the rivers to overflow their banks; a flood that rises and falls rapidly with little or no advance warning is called a flash flood. Flash floods usually result from intense rainfall over a relatively small area.

FLOODS HAVE ALSO CAUSED MASS DEVASTATION LEADING TO SUBMERGING OF WHOLE VILLAGES CITIES UNDER WATER.TILL DATE ABOUT 370,045,000 PEOPLE HAD SUFFERED DESTRUCTIVE FLOODS. : 

FLOODS HAVE ALSO CAUSED MASS DEVASTATION LEADING TO SUBMERGING OF WHOLE VILLAGES CITIES UNDER WATER.TILL DATE ABOUT 370,045,000 PEOPLE HAD SUFFERED DESTRUCTIVE FLOODS.

HURRICANES : 

HURRICANES HURRICANE IS LARGE SYSTEM OF WINDS THAT ROTATES ABOUT CENTRE OF LOW ATMOSPHERIC PRESSURE.CYCLONIC WINDS MOVE ACROSS NEARLY ALL REGIONS OF EARTH EXCEPT THE EQUATORIAL BELT AND ARE GENERALLY ASSOCIATED WITH RAIN AND SNOW.

HURRICANES THE SYSTEM OF WIND HAD CAUSED VAST DESTRUCTION IN PAST. RECENTLY KATRINA HIT VARIOUS PARTS OF U.S.A. HAS SHOOK THE WHOLE WORLD : 

HURRICANES THE SYSTEM OF WIND HAD CAUSED VAST DESTRUCTION IN PAST. RECENTLY KATRINA HIT VARIOUS PARTS OF U.S.A. HAS SHOOK THE WHOLE WORLD

TSUNAMI : 

TSUNAMI Tsunami, Japanese word, meaning “harbor wave” and used as the scientific term for seismic sea wave generated by an undersea earthquake or possibly an undersea landslide or volcanic eruption. When the ocean floor is tilted or offset during an earthquake, a set of waves is created similar to the concentric waves generated by an object dropped into the water. Most tsunamis originate along the Ring of Fire, a zone of volcanoes and seismic activity

TSUNAMI THAT HIT VARIOUS PARTS OF ASIA HAD KINDLED LARGE DESTRUCTION AND EVEN VANISHED SOME ISLANDS AND THERE IS NO SIGN OF LIFE AT SOME PLACES. : 

TSUNAMI THAT HIT VARIOUS PARTS OF ASIA HAD KINDLED LARGE DESTRUCTION AND EVEN VANISHED SOME ISLANDS AND THERE IS NO SIGN OF LIFE AT SOME PLACES.

VOLCANOES : 

VOLCANOES Volcanoes erupt differently depending on the composition of the magma beneath the surface, the amount of gas in the magma, and the type of vent from which it erupts. In general, the more viscous, or stiffer, the lava, the more explosive the eruptive activity. During explosive eruptions, the lava erupted is torn into shreds, forming a variety of fragmental or pyroclastic materials depending on the physical state of the lava and on the force of the explosions. Explosive eruptions can eject a large amount of material into the air. All volcanoes are formed by the accumulation of magma (molten rock that forms below the earth's surface). Magma can erupt through one or more volcanic vents, which can be a single opening, a cluster of openings, or a long crack, called a fissure vent.

VOLCANIC ERUPTIONS IN THE PAST HAD CAUSED MASSIVE DEVASTATION LEADING TO THOUSANDS OF PEOPLE LOSING THEIR LIVES.VOLCANIC ERUPTIONS HAS ITS AFFECTS OVER LARGE AREAS. : 

VOLCANIC ERUPTIONS IN THE PAST HAD CAUSED MASSIVE DEVASTATION LEADING TO THOUSANDS OF PEOPLE LOSING THEIR LIVES.VOLCANIC ERUPTIONS HAS ITS AFFECTS OVER LARGE AREAS.

TORNADOES : 

TORNADOES Many tornadoes, including the strongest ones, develop from a special type of thunderstorm known as a supercell. A supercell is a long-lived, rotating thunderstorm 10 to 16 km (6 to 10 mi) in diameter that may last several hours, travel hundreds of miles, and produce several tornadoes. Supercell tornadoes are often produced in sequence, so that what appears to be a very long damage path from one tornado may actually be the result of a new tornado that forms in the area where the previous tornado died. Sometimes, tornado outbreaks occur, and swarms of supercell storms may occur. Each supercell may spawn a tornado or a sequence of tornadoes.

TORNADO THE THUNDERSTORM HAD CAUSED GREAT LOSS OF LIFE AND PROPERTY AND HAD TAKEN LIFE OF MANY PEOPLE . : 

TORNADO THE THUNDERSTORM HAD CAUSED GREAT LOSS OF LIFE AND PROPERTY AND HAD TAKEN LIFE OF MANY PEOPLE .

CAUSES OF NATURAL DISASTERS : 

CAUSES OF NATURAL DISASTERS POPULATION DEFORESTATION ENVIRONMENTAL DEGRADATION

Slide 20: 

POPULATION GROWTH,DEFORESTATION AND ENVIRONMENTAL DEGRADATION ARE INTERRELATED .POPULATION GROWTH LEADS TO DEFORESTATION AND CAUSES ENVIRONMENTAL DEGRADATION AND DISTURBS THE BALANCE OF NATURE.IN ORDER TO RESTORE THE BALANCE OF NATURE NATURAL DISASTERS OCCUR.

Slide 21: 

WORLD`S POPULATION HAS ALREADY REACHED AN ALARMING POINT.TO MEET THE NEED OF FAST GROWING POPULATION WE ARE DISTURBING THE ECOLOGICAL BALANCE OF NATURE.CHINA, INDIA RUSSIA ,U.S.A. ARE MAJOR CONTRIBUTORS TO THIS.

DEFORESTATION : 

DEFORESTATION

DEFORESTAION HAS LEAD TO THE CONVERSION OF FERTILE LANDS INTO BARREN LANDS AND HAS DISTRUBED THE ECOLOGICAL BALANCE. : 

DEFORESTAION HAS LEAD TO THE CONVERSION OF FERTILE LANDS INTO BARREN LANDS AND HAS DISTRUBED THE ECOLOGICAL BALANCE.

Slide 25: 

NATURE IS BEING DESTROYED RACKLESSLY. ECOLOGICAL BALANCE IS BEING DISTRUBED REGULARLY. BUT......

NATURE RESTORING ITS BALANCE : 

NATURE RESTORING ITS BALANCE NATURE IS NOT TAKING ITS REVENGE IT IS JUST RESTORING ITS BALANCE.NATURE IS BOUNTIFUL.NATURAL DISASTERS IS A WAY OF RESTORING ITS BALANCE.IF MAN FULLFIL ITS NEED BY KILLING TRESS NATURE RESTORES ITS BALANCE BY KILLING MAN.

Slide 27: 

OUR MYTHOLOGY SAYS THAT WHENEVER MAN`S GREED HAS CROSSED ITS LIMITS AND DISTRUBED THE BALANCE OF NATURE ,GOD HAS ALWAYS STOPPED ITS GREED BY REFLOURISHING THE EARTH.

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There is a pleasure in the pathless woods,There is a rapture on the lonely shore,There is society, where none intrudes,By the deep sea, and music in its roar:I love not man the less, but Nature more . . MAN`S HEART AWAY FROM NATURE BECOMES HARD. I love to think of nature as an unlimited broadcasting station, through which God speaks to us every hour, if we will only tune in

Slide 29: 

Nature provides a free lunch, but only if we control our appetites. There is a sufficiency in the world for man's need but not for man's greed. When we heal the earth, we heal ourselves.

Slide 30: 

Nature cannot be tricked or cheated.  She will give up to you the object of your struggles only after you have paid her price. Let us permit nature to have her way.   She understands her business better than we do.

Slide 31: 

DON`T BLOW IT GOOD PLANETS ARE HARD TO FIND. WE HAVE ONLY ONE PLANET TO LIVE ON SAVE IT ELSE WE SHALL PERISH.

Slide 32: 

The most selfish one letter word........... "I" Avoid it.

Slide 33: 

The most satisfying two-letter word....... "WE" Use it.