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______ is cutting down of forests by humans
Deforestation
Environmental problems have ______ effect on the environment.
negative
3 arrows diagram is a tool to describe _________ of a particular problem.
cause, effect and solution
Agricultural expansion is one of the ________ of deforestation.
causes
Flood is one of the effects of ________.
deforestation
Carbon dioxide, methane and water vapour are all __________.
greenhouse gases
Any greenhouse gas can _______ heat.
trap
Rise of greenhouse gases in the atmosphere can make the earth warmer. It is a process called ______.
global warming
What are the two major gases in our atmosphere?
Nitrogen and oxygen
Toxic gases in the atmosphere are called _________ because they cause air pollution.
air pollutants
CO stands for ______.
carbon monoxide
SO2 stands for ?
Sulfur dioxide
In factories and power stations, toxic gases are produced by burning ________
fossil fuels (coal and oil)
When sulfur dioxide dissolves in water droplets in the clouds, ________ is formed.
sulfuric acid
Acidity in the lake eats away _______ in tough shell of certain animals.
calcium
When acid rain dissolve in water of some lakes, that water become _______.
acidic
