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Geographical Skills

Reading population pyramids, choropleth and flow-line maps

  • 2 things to know
  • All three papers

Overview

Interpreting population pyramids with wide or narrow bases and missing age groups, reading choropleth maps and their weaknesses, what a flow line shows, and reading range, median and spread from dispersion graphs.

What you need to know

Answer each one before you reveal it.

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Key term

What do the two sides of a population pyramid stand for?

Key term

What does a population pyramid with a very wide base and a narrow top show about a country?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What do the two sides of a population pyramid stand for?

    Model answer

    Males on one side and females on the other, with each bar covering one age group.

  2. 2

    What does a population pyramid with a very wide base and a narrow top show about a country?

    Model answer

    A high birth rate giving very many children, and a short life expectancy, so few people survive into old age.

  3. 3

    What does a pyramid with a narrow base and bulging middle and upper bars show?

    Model answer

    A low birth rate and an ageing population, with a large share of people over 65.

  4. 4

    What does an unusually short bar for young adult males on a pyramid suggest?

    Model answer

    That many young men have left the area to find work elsewhere, or that war or disease has removed them.

  5. 5

    How is a value read from a choropleth map?

    Model answer

    The shade of the area wanted is matched against the key, which gives the band of values it falls in rather than one exact figure.

  6. 6

    What is the main weakness of a choropleth map?

    Model answer

    It makes each area look uniform, hiding variation inside it, and its boundaries suggest sudden jumps that do not really exist on the ground.

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