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The Earth's internal heat mainly comes from
There are different reasons on the Earth because of
On average, Air contains ________ % of water vapours.
Earth's troposphere extends from the Earth's surface to an average height of about ________ km.
Ships use ________ to find the depth of the ocean beneath them.
Molecules with identical molecular formulae but with different structural formulae are called
The anode is the electrode connected to the ________ terminal of a battery.