Population Chapter 4 Section 2 7 th grade Social Studies

Define: Population Population density Migration

What is population? The total number of people in a given area Population influences businesses, transportation, and schools Geographers are interested in population patterns that emerge over time

Population Density A measure of people living in an area Per square mile or kilometer – Japan has a high population density – Australia has a low population density

High vs. Low Population Density High = expensive land, crowded roads, taller buildings Low = open spaces, less traffic, more available land

Population Density Map What do you think the different colors mean?

Where People Live Areas with low populations = land does not provide good life – Mountains, harsh deserts, frozen ground Areas with high populations = fertile soil, reliable sources of water, good agricultural climate

Tracking Population Changes Three key statistics to learn about population changes Birthrate, death rate, rate of natural increase Birthrate – death rate = natural increase

Natural Increase Rates Around the World USA and some European countries have a very low natural increase rate Russia has more people dying than being born = negative natural increase Mali has a very high natural increase – Population expected to double in 20 years!

What are some problems countries with high natural increase rates may face?

Migration Migration = the process of moving from one place to live in another Push factors = warfare, lack of jobs, lack of good farmland Pull factor = opportunities for a better life

World Population Trends Since 1800 better health care and improved food production have supported tremendous population growth

Trends 1 st trend = population of industrialized areas is slowing – Germany, France 2 nd trend = Less industrialized countries often have high growth rates – Affect workforce, government aid

Population clock What is the current US population? What is the current world population? Click on World POPClock Notes. Scroll to the bottom and click on Worldpop and then click on World Vital Events Per Time Unit. How many births are there per second in the world? How many deaths per second? What is the natural increase per second in the world?

Answer Questions on pg 90: 1. a (look at map on page 87 – find specific places) 1. c 2.b

7 billion People rZ0 Fz4 rZ0 Fz4