Physics
Solar eclipse will take place when

the earth is between the moon and the sun
the moon is between the sun and the earth
the moon does not lie on the line joining the sun and the earth
the sun is between the moon and the earth

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Physics
Skating on ice is possible because

The surface of ice is smooth
Ice is cold
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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