Physics
X-rays region lies between

Short radio waves and long radio waves
Ultraviolet and visible region
Gamma-rays and ultraviolet region
Visible and infra-red region

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Physics
Skating on ice is possible because

Ice is cold
The surface of ice is smooth
The pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water
The pressure on the ice due to skate raises its melting point

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