Pathogen

Disease-causing agent (1)

Pathway (of pollution)

The way a pollutant moves from the source, enters the environment and reaches the recipient (7)

Percolate

Trickle through (4)

Peri-urban

Areas around a city or town in transition between the urban and rural areas and having some characteristics of both (5)

Permeability

The ease with which water moves through soil or rock.(1)

Permeable

Water or other liquids can pass through (4)

Persistent organic pollutants (POPs)

Group of toxic and persistent synthetic organic pollutants including many pesticides such as DDT, aldrin (7)

Persistent pollutant

Pollutants that remain intact when released into the environment because they do not break down by natural processes (7)

pH

Measure of acidity and alkailinity on a scale from 0 to 14. pH 7 is neutral, below 7 is acidic and above 7 is alkaline (8)

Point source (of pollution)

Identifiable points or places where the source of pollution can be easily located (7)

Policy

Statements of overall purpose that set out goals and provide principles that should be followed to achieve those goals (15)

Polluter pays principle

Whoever is responsible for pollution should pay for the damage caused (8)

Pollution

Introduction into the environment of substances liable to cause harm to humans and other living organisms (1)

Pollution control

Measures taken after wastes have been produced to limit the damage they may cause (8)

Pollution prevention

Avoiding or minimising the generation of wastes that produce pollutants (8)

Population composition

Characteristics of a group of people in terms of factors such as their sex, age, marital status, education, occupation, and relationship to the head of household (2)

Population pyramid

Graph that displays a population’s age and sex composition (2)

PPM

Parts per million; a unit of concentration (7)

Practices

Routine actions, doing something in the same way every time (13)

Precautionary principle

Be cautious rather than take risks about unknown consequences; do not to throw any waste to the environment even if you are not certain that damage will result (8)

Precipitation

Collective term for rain and snow (4)

Proclamation

Declared by the parliament, the level of law in ethiopia below the constitution (15)

Programme

Any set of related events, activities or projects (15)

Protocol

Supplement to a convention or treaty that adds details of rights or obligations (14)

Pull factors

Factors that attract people to urban areas (5)

Push factors

Factors that drive people away from the countryside (5)