The uppermost layer over the earth's surface is called the ______.
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The market structure called monopoly exists where there is exactly ______ seller in any market.
Any undesirable change in physical, chemical or biological characteristics of air, land, water or soil is called?
In science a push or pull of an object is called ________.
The later (second) formed primary xylem elements are called _____________.
What is the process of rust forming on iron called?
If the orbit of a planet is an ellipse then what is the point at which the Sun is located called?
The first formed primary xylem elements are called ___________.