"At the back of the bond paper"
"AIR POLLUTION"
What are primary and secondary sources
A primary source is a raw data collected first-hand by the researchers
or writers done through research. These data can be gathered through
"surveys, interviews, books, observations and experiments.
Ex: Scanning the books in the library to research about Astronomy.
Meanwhile a secondary source is a data that can be gathered
through electronic devices such as computer which uses the Internet
connections and other sources of information electrically.
Ex: Browsing the web to gather information about the latest issue about COVID-19 Pandemic
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Answer:
Primary Source of Deforestation : Direct causes of deforestation are agricultural expansion, wood extraction
Secondary Source of Deforestation : Timber or logging, Ranching, Plantation agriculture, Smallholder agriculture, Fuelwood, Road construction, Mineral extraction, Hydroelectric development.
Primary Source Of Water Pollution : The main source of water pollution is from sewage and waste water treatment, Agricultural Pollution and Oil Pollution.
Secondary Source of Water Pollution : Radioactive Substances, River dumping and Marine Dumping are just some of the secondary source of water pollution
Primary Source of Air Pollution : Mobile sources such as cars, stationary sources such as power plants, factories
area sources such as agricultural areas, natural sources such as wind-blown dust, wildfires, and volcanoes
Secondary Source of Air Pollution : Its secondary source include ozone, which is formed when hydrocarbons and nitrogen oxides combine in the presence of sunlight
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