| too many people living in a place |
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| disease that spreads fast and kills millions of people |
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| the number of babies born per 1,000 people |
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| how many people live in a certain space |
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| line around the middle of the Earth |
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| people born in the two decades after World War II |
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| someone who doesn't work any more because they are too old |
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| about the countryside |
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| about the city |
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| the government's way of dealing with a problem |
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| an operation that kills an unborn baby |
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| someone who leaves their country, mostly because of a war |
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