It is important to find the beginning and end of a sea, because, in reality, all the seas on our planet are one. The waters from one sea are connected to the others.
Waters covers three quarters of the earth’s surface. People have divided the sea into different oceans and given them names: the Pacific, the Atlantic, the Indian, the Artic, and the Antarctic Ocean. Seas and oceans are unique to our planet in the solar system.
About 2.5 billion years ago life began in the sea. Since then, life on the earth sustained by the existence of the sea.
The Water Cycle
Climate, the shape of the mountains, and the way our planets different creatures live all depend on the sea.
The clouds, the rain, the snow, and the rivers and lakes are created by the action of seawater. The sun heats seawater, which then evaporates. The water vapor then condensed to become clouds, from which rain or snow falls. The water then returns to the sea by the way of rivers and streams. Some of the water filters through the ground and forms underground reservoirs. All of this is what known as the water cycle.
Day after day, year after year, for millions of years, the sun has evaporated seawater and then returned it to the sea along rivers. Water itself has never stopped renewing itself.
The quantity of earth’s water has remained constant because water is not destroyed when it is used. Water comes to us in the form of clouds, rain, snow, rivers, lakes, and seas.
The Water Cycle (Click on the picture to view large)
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