Environmental hazards and disaster

1. Hazards
A. Hemanth Venkata sai

2. CONTENTS
 Disaster
 Types of disasters
 Classification of natural and man-made disasters
 Natural Disaster
 Planetary hazards
 Extra planetary hazards
 Man induced hazards
 Nuclear Explosion
 Population Explosion
 Endogenous Disaster
 Exogenous Disaster

3. DEFINITION
A hazard can be defined as a potentially damaging physical event,
social and economic disruption or environmental degradation. Typical
examples of hazards can be absence of rain (leading to drought) or the
abundance thereof (leading to floods).

4. Disaster
A disaster is a serious disruption, occurring over a relatively short
time, of the functioning of a community or a society involving
widespread human, material, economic or environmental loss and
impacts, which exceeds the ability of the affected community or society
to cope using its own resources.

5. TYPES OF DISASTERS
• Natural Disaster
• Planetary Disaster
• Extra planetary Disaster
• Man induced Disaster
• Endogenous Disaster
• Exogenous Disaster

6. Classification of natural and man-
made disasters

7. Natural Disaster
Natural hazards are associated with extreme
events in the normal operation of the planet’s in the
geological, hydrological and ecological systems.
Natural hazards are limited to inhabited
areas(vulnerable Settlements and economic
infrastructure.)

8. What is natural disasters
A natural disaster is a sudden, catastrophic event caused
by natural processes of the Earth. Different types of natural
disasters include floods, earthquakes, hurricanes, volcanic
eruptions and many more.

9. CAUSES OF NATURAL DISASTERS
The three main causes of natural disasters include movement of the
Earth, the weather and extreme conditions. When the Earth
moves, it can cause earthquakes, volcanic eruptions and tsunamis.
• Predicting these natural disasters is often difficult for scientists and
they can occur suddenly. Extreme weather conditions can cause
natural disasters such as tornadoes and hurricanes. These natural
disasters are sometimes easier to predict, but they too can come on
suddenly.
• Floods, mudslides and famines are often caused by extreme weather
conditions or movement of the Earth. Many scientists see these types
of events as secondary natural disasters and the causes vary greatly.

10. PREVENTION AND CONTROL OF NATURAL DISASTERS
• Natural disasters are inevitable , even if we have the technology to
predict disasters we cannot stop it from occurring. The best that we
can do is to stop the practices that are harmful to our environment
that are harmful to our environment and leading to environmental
degradation and at the same time , we should also prepared for a
disasters with our disaster management plan.

11. Types of natural disasters
 Landslides.
 Earthquakes.
 Sinkholes.
 Volcanic eruptions.
 Floods.
 Tsunami.
 Limnic eruptions.
 Cyclonic storms

12. Cyclonic storms

13. Volcanic eruptions

14. Landslide

15. Earthquakes

16. Man induced hazards
• Physical hazards:
Earth quake, erosion, landslide.
• Chemical hazards:
Release of toxic chemical , Nuclear Explosion.
• Biological hazards:
Eutrophication, population Explosion.

17. Nuclear Explosion
A nuclear explosion is
an explosion that occurs as a
result of the rapid release of
energy from a high-
speednuclear reaction.

18. Population Explosion
The rapid increase in numbers of a
particular species, especially in the
world's human population since the
end of World War II, attributed to an
accelerating birthrate, a decrease in
infant mortality, and an increase in life
expectancy.

19. Exogenous hazards
Processes that are caused by forces from within the Earth are
endogenous processes. By contrast, exogenous processes come
from forces on or above the Earth's surface. Endo is a prefix
meaning "in" while Exo is a prefix meaning "out". ...
Many exogenous (extraterrestrial) forces are as a result of
other bodies in space.

20. Planetary hazards
Planetary hazards occurs due to the mismatch of the two orbits
or deviating of planets from their path and gets collided .

21. Extra planetary hazards

22. Earth quake
• An earthquake is the shaking of the surface of the
Earth, resulting from the sudden release of energy in
the Earth's lithosphere that creates seismic waves.

23. Landslides
A landslide is defined as the movement of a mass of
rock, debris, or earth down a slope. Landslides are a type
of "mass wasting," which denotes any down-slope
movement of soil and rock under the direct influence of
gravity.

24. Endogenous hazards
Processes that are caused by
forces from within the Earth
are endogenous processes. By
contrast, exogenous processes
come from forces on or above the
Earth's surface. ... Impacts from
comets and meteoroids change the
surface of the Earth.