Study of earth is known as
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The 'solid waste' is also known as
The outermost layer of Earth is called _______.
In 2004, NASA launched the Messenger Spacecraft to study ___.
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?
Saturn is the _______ planet from the Sun.
Which of the following is the most abundant metal on Earth's crust?
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