If you’ve ever swum in the ocean, you’ve probably tasted a mouthful of seawater. It’s pretty salty. In fact, it’s 220 times more salty than freshwater. Th t’s a lot of salt! And scientists have wondered for a long time why the oceans contain so much salt. After all, freshwater pours into the oceans from rivers all over the world 365 days each year, and millions of gallons of water fall on the oceans as rain all the time. But that’s actually part of the reason why the sea got so salty in the first place, and stays salty now.View More Why Ocean is salty?
Only 30% of Earth’s surface is exposed land. the rest is covered by a huge body of salt water with a volume of more than 1 billion cubic kilometers: the world ocean. Twice a day, the oceans of the globe rise and fall by several meters. Tides are caused by the gravitational pull of the Moon , and to a certain extent of the Sun , on our planet. the seas and oceans also move in waves —undulations of the surface of the water generated by the wind. Ocean currents , on the other hand, are movements of huge masses of ocean water along very precise routes.View More THE WORLD OCEAN