What is the main cause of temperature rise in the interior of the Earth?
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What is the sound made by seal called?
Which of the following is not a commercial source of energy?
Thermal electricity is generated by using which of these ?
What are Equinox days?
Minamata disease is a nervous disorder caused by eating fish, polluted with _____
What is the process of waste water treatment is commonly known?
The salt concentration (measured as salinity in parts per thousand), is less than ______ % in inland waters.