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The largest ecosystem of the Earth is:
The layer of the atmosphere in which Radio Waves are reflected back is called:
The surface temperature of the sun is estimated as:
Most of the devastating earthquakes are usually caused by:
Which is the coldest among the following?
Mountain soil contains a lot of—
Which type of lake is formed by volcanic activities?
Choose the correct option which represents the arrangement of atmospheric layers.
Stratellite is the .
Which of the following statements is correct?