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Why Seawater is Salty?
Most of our planet’s surface is covered in water – salt water. The oceans that support so much of Earth’s life are around 3.5% sodium chloride – 50 million billion tonnes of salt.
But where does it come from? While some of it comes from volcanic vents or rocks on the seabed, most of it is actually from the land around us. Every time it rains, tiny amounts of mineral salts are washed into rivers, which eventually flow into the sea.
The salt in rivers is less than 1/200th the amount usually found in seawater. It becomes more concentrated in the ocean, as the Sun’s heat causes water from the surface to evaporate, leaving the salt behind. Extra salt added every year from rivers is balanced by salt which returns to the sea floor.
But salinity isn’t the same everywhere. Towards the poles, water is not as salty because it’s diluted by melting ice, while the extra heat in the tropics makes water there saltier – and denser.
These information below can be found in the text, except...
Tiny amounts of mineral salts are washed into rivers which flow into the sea.
The oceans contain 50 million billion tonnes of salt.
The amount of salt in rivers is less than the amount that is usually found in seawater.
Our planet in mostly covered in salt water.
The extra heat in the tropics make the water less saltier and less dense.
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A. Mufida
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Alul Apriansyah
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