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