Desalination Plant
A kind of factory that removes salt from water, usually seawater.

Evolution
The theory that animals and plants change over time as conditions in their environments change.

GDP
This stands for 'Gross Domestic Product', which means the amount of money that a country makes in a year. It is usually divided between the number of people in the country to make an average wealth per person.

Hurricane
Severe tropical storms that bring very strong winds and heavy rain. Hurricanes can whip up waves to dangerous heights too.

Independent
When a colony wins the right to control its own affairs.

Infant mortality
The number of babies out of every thousand born that die before the age of one.

Latitude
Imaginary lines on the Earth that run parallel to the equator.

Life expectancy
How long people are expected to live. This is measured in years.

Longitude
Imaginary lines on the Earth that join the North and South Pole like segments of an orange.

Paddy
A field planted with rice.

Plantation
A type of farm found in tropical areas. A plantation usually covers a large area and grows one or two types of crop.

Population Density
The number of people per square kilometre.

Ratio
The relation between one number and another.