The outermost layer of Earth is called _______.
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The 'solid waste' is also known as
If water smells bad, then that odour can be removed by adding
What is the name of the balloon – borne instrument set to be launch by NASA to study heavy cosmic particles?
Which of the following three R's are regarded as environment friendly?
In 2004, NASA launched the Messenger Spacecraft to study ___.
Saturn is the _______ planet from the Sun.
Which of the following is the most abundant metal on Earth's crust?