Population Dynamics Natural change and Actual Change.
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Transcript of Population Dynamics Natural change and Actual Change.
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Population Dynamics
Natural change and Actual Change
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Natural Change
• A change in the population due to the difference in # of births and the # of deaths.
BIRTHS - DEATHS = NATURAL CHANGE
BIRTHS > DEATHS = NATURAL INCREASE
BIRTHS < DEATHS = NATURAL DECREASE
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Which Natural Change?
• 6300 Births 7800 Deaths
• Population had a NATURAL DECREASE of 1500 people.
• 4800 Deaths 5500 Births
• Population had a NATURAL INCREASE of 700 people.
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Birth Rate• The # of births per 1000 population.
Calculation:
# births in one year x 1000 = Birth Rate
Total Population
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Death Rate• The # of DEATHS per 1000 population.
Calculation:
# deaths in one year x 1000 = Death Rate
Total Population
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Rate of Natural Increase (RNI)• Difference between the Birth Rate and
the Death Rate
• Formula:
• RNI = BR - DR
• Like before:– positive number (+) = naturally
increasing population
– negative number (-) = naturally decreasing population
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Sample Exam Question
Sample Exam Question WITH Other Distracting Stats!
Sample Exam Question
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Highly Developed Countries: Population, BR & DR
• Have a stable population!
• Birth Rates are generally low
• Death Rates are also generally low.
• WHY?
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Highly Developed Countries – BR: The REASONS!
Birth Rates are generally low because:
• Access to birth control
• Affordable birth control
• Women choosing careers (less kids, no kids, kids later in life)
• Lifestyles…leisure, travel, materialistic
• Education about family planning
• MUST STUDY!!!!!!
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Highly Developed Countries – DR: The REASONS!
Death Rates are also generally low:
• Advances in modern medicine and technology
• Access to health care
• Affordable health care
• Education & knowledge about healthy lifestyles & choices.
• Improved water and sanitation!!!!
• Better nutrition choices!!!!
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Underdeveloped Countries: Population, BR & DR
• Have an EXPANDING population!
• Birth Rates are generally high.
• Death Rates are also generally high.
• Expanding because births are exceeding deaths at larger rates.
• WHY?
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Underdeveloped Countries
• Birth Rates are generally high because:
• LITTLE to NO access to birth control
• Can’t Afford birth control..(food or birth control??)
• Children needed or used to contribute to the family (labor, money, food)
• Lack of education about family planning
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Underdeveloped Countries
• Death Rates are also generally HIGH:
• Lack of modern medicine and technology
• Little or NO access to health care
• Unable to afford health care
• Lack of education & knowledge about healthy lifestyles & choices.
• Lack of clean water and sanitation
• Malnutrition
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Actual Population Change & Migration
• Migration means the MOVEMENT of people from place to place.
• Immigration is the movement of people INTO a country. ADDS to the receiving countries population.
• Emigration is the movement of people OUT of a country…EXIT. TAKES away from the country of departure.
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Actual Change• While Natural Change only deals
with births and deaths…
• Actual change recognizes ALL factors that can change a population. Births, deaths, Immigration and Emigration.
• AC = (B + I) – (D + E)
AC = (Births + Immigration) – (Deaths + Emigration)
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More on migration!!• NET MIGRATION = the difference between immigration and
emigration.
• MAP shows countries with +/- Net Migration.
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More on migration!!• INTERNAL MIGRATION refers to the migration of
people within a country province or region.
• Newfoundland Labrador in the past 20+ years had been moving to Alberta & Ontario in search of jobs etc.
OR
• Newfoundland Labrador experiences a fair degree of internal migration as people move from smaller outports to St. John's.
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Sample MC Question