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3. Why some people are at a higher risk to be affected by tropical cyclones than others

If you look at the map of the world (figure 8 on p. 33) on which the ground-plates are indicated, you will notice that we find some of the world’s most densely populated areas in these danger zones. Should an earthquake occur, many lives could be lost.

In developed countries or regions like Europe, the USA and Japan an earthquake’s damage can be limited and losses minimised. Buildings, bridges and roads are built to resist the effect of earthquakes. The infrastructure in such countries are highly sophisticated and their health care and medical services are immediately available in case of emergencies.

It is different, though, in developing countries. Many people die and constructions are easily destroyed. Buildings are usually erected in the cheapest possible way and cannot withstand the force of an earthquake. Thousands are left homeless, hungry and injured. The poor infrastructure prevents that aid reaches them soon enough. Corpses start decaying and drinking water is polluted, spreading disease which increases the number of deaths.

Activity 4:

To discuss the reason why people live in areas where earthquakes occur

[lo 2.2]

1. Why do people decide to live in areas where earthquakes occur? Take some time to think about this and then give your own opinion.

2. Where would you hide if an earthquake struck in your environment?

4. Precautionary measures: managing risk and reducing risk

Can earthquakes be forecast?

Unfortunately, this is not always possible. However, the earth’s crust is intensively studied and sensitive instruments register the slightest movement in the crust.

Scientists use special methods and apparatus, e.g. seismographs, to study and forecast earthquakes. A seismograph can detect any movement in the earth’s crust. When foreshocks occur scientists are able to detect activity in the earth’s crust and issue warnings in time. Some satellites are also equipped to pick up movement in the earth’s crust.

There are also other non-scientific signs in nature that, if observed in time, could help to forecast an earthquake, e.g.

  • a sudden significant change in the level of groundwater (e.g. in wells);
  • the sudden strange behaviour of animals.

If earthquakes could be forecast in time, warnings to evacuate the danger zones could be issued and so loss of life could be limited. Whether all people listen to such warnings is an open question.

Remember – not all earthquakes can be forecast. Some happen suddenly, without any foreshocks or other signs.

Activity 5:

To list emergency measures in case of an earthquake

[lo 2.3]

Imagine that you live in an area where earthquakes occur frequently (where there is a weak place in the earth’s crust). Draw up a list of emergency measures that should be applied before, during and after an earthquake.

Copy the world map from Figure 8 and indicate the areas where earthquakes occur on your own map. Then use red to colour in these areas.


Learning Outcomes(LOs)
LO 2
GEOGRAPHICAL KNOWLEDGE AND UNDERSTANDINGThe learner will be able to demonstrate geographical and environmental knowledge and understanding.
Assessment standards(ASe)
We know this when the learner:
2.1 describes and explains how natural hazards such as volcanoes, earthquakes and flooding occur, and their impact on human lives and socio-economic activities [people and places];2.2 investigates and explains why some people face a higher risk than others with respect to natural hazards [people and resources];2.3 identifies how risks and hazards can be managed [people and the environment].

Questions & Answers

how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
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s. Reply
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Devang Reply
are you nano engineer ?
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Mostly, they use nano carbon for electronics and for materials to be strengthened.
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s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
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s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
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Sanket Reply
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preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
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I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit Reply
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Source:  OpenStax, Geography grade 7. OpenStax CNX. Sep 09, 2009 Download for free at http://cnx.org/content/col11021/1.1
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