Land covers about ______ of the earth's surface.
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What was the shape of the galaxy named A1689 B11 that existed 11 billion years ago?
Equinox means the date when ___________.
At which of the following place, weight of an object is maximum?
The place on the earth's surface above the focus is called the __________.
_________ affect the rate of humus formation of soil.
What is study of fungus known as?
Chernobyl disaster is the result of pollution by_____________