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Populatio nok
 

Populatio nok

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    Populatio nok Populatio nok Presentation Transcript

    • Global population growth
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    • World population
      • First stage: mortality and natality are high so natural increase was low.
      • Second stage: in this stage mortality decreased a lot while natality remained high. As a result of this situation there was a big population growth and life expectancy increased.
      • Third stage: mortality and natality decrease, population growth started to decrease. Nowdays in some countries there is a negative population growth.
    • There were many improvements which made possible the population growth in 19 th century:
      • Hygiene and sanitation
      • Diet.
      • Vaccine.
      • Health care.
      • New medicines.
    • Alexander Fleming discovered the penicillin in 1928.
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    • Unequal distribution of population
    • Physical factors
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    • Population density: Total population Surface area
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    • Example: Population 46.000.000 inhabitants Density in Spain : 504.645 Km Population Density in Spain: 91inhab/km
    • To work out the natality we use rate birth: total number of births over a year BR = X 1000 total population
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    • MORTALITY number of deaths over a year DR = X 1000 total population
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    • NATURAL INCREASE: Number of births Number of births Number of deaths
    • There are two ways to work out the rate of natural increase.
      • 1) Birth rate Death rate
      • 2) NI X 100
      • total population
    • POPULATION STRUCTURE
      • By sex : more boys are born but women have more life expectancy.
      • By age : Europe is the region with more old people around the world. Old people represent the 21% of the total population while children represent 15 %.
      • Inside Europe Spain has the most difficult situation because according with the ONU studies in 35 years, Spain will be the oldest population around the world.
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    • By labour force rate : this rate includes people who is working and people who is looking for a job. Nowdays, unemployement is increasing in Spain, the figure is more than 22 %. This is the double than many european countries The average in Europe is around 9%.
    • Expanding population pyramid
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    • Expanding population pyramid
      • This kind of pyramid shows natality and mortality high. This is typical of developing countries.
    • Stable population pyramid
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    • Stable population pyramid
      • Natality and mortality are constant. Population tends to age.
    • Contracting population pyramid
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    • Contracting population pyramid
      • This type of pyramid indicates a reduced natality and mortality. Population tends to age and decrease. This is typical of developed countries.
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    • " Yo, ¿estudiar? ¡Si gano 3.000 pavos en el tajo!. La cita es literal. Al ocupar el apartamento que había alquilado para ese mes de agosto en Cádiz me encontré con un problema de albañilería. La propiedad me envió a un chaval que apenas rozaría los 18 años, pelo rapado de pincho, cadenota de oro y mucho, mucho desparpajo. Se me ocurrió preguntarle por su formación y fue como abrir la espita a un geiser. “Aquí no estudia ni dios, quillo. Pa qué. Mira, con esto me levanto 3.000 pavos al mes y tengo pa tó. Que si el quad, que si las tías, que buen rollito por aquí y por allá. Soy el rey. Currar y disfrutar, que pa eso no hay que usar la cabeza”