There is a protocol signed to reduce production of CFC, known as
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Which of the following is NOT a metamorphic rock?
The Ozone layer is present in which atmospheric layer?
Which of the following fuels causes minimum environmental pollution?
Salination of soil is caused by
Which of the following is the most abundant metal on Earth's crust?
Thermal electricity is generated by using which of these ?
The ozone layer protects us from harmful _______________ rays of the sun.
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