World Geography
The longest ship canal in the world is the

St. Laurence Seaway (USA and Canada)
Panama canal, Central America
Suez canal, Egypt
Kiel canal, Germany

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World Geography
The periodic rise and fall of the sea level on the earth, gives rise to tides. This is related to

infrared rays from the sun
ultraviolet rays from the sun
the position of the moon with reference to the earth and the gravitational pull exerted mainly by the moon and partly by the sun
None of these

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