Why Is Ocean Water Salty_ _ Earth's Ocean _ Dr Binocs Show _ Peekaboo Kidz_HD

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Transcript

00:00You can't drink ocean water, Kitty. It's salty.

00:07Hmm. That's an excellent question.

00:11Hey, friends! I'm sure while taking a dive in an ocean,

00:15you must have got a little bit of salt in your mouth.

00:19I'm sure you must have got a little bit of salt in your mouth.

00:24I'm sure you must have got a little bit of salt in your mouth.

00:29You must have got a little taste of its salty water,

00:33making you wonder who must have added so much salt to it.

00:38Well, in today's episode, let us try to debunk this mystery

00:43and answer a deep question.

00:46Why is the ocean water salty?

00:50Zoom in!

00:53The world is surrounded by water.

00:56In fact, oceans cover 70% of Earth's surface

01:00and account for about 97% of all water.

01:05And approximately around 3.5% of total ocean water is salt.

01:12Which may not sound like too much,

01:14but it works out to 120 million tons of salt per cubic mile of sea water.

01:21But the vital question is, where did all the salts come from?

01:27Well, salt in the ocean comes from mainly two sources,

01:33runoff from the land and openings in the sea floor.

01:38You see, when the rain forms and pours through the air,

01:43it collects carbon dioxide from the atmosphere on its way,

01:48turning the fresh water slightly acidic in nature.

01:52And once this acidic water meets the land surface,

01:56it erodes the rocks and picks up small amounts of salt

02:00and other dissolved minerals already present in the rocks.

02:05At this point, the water is still basically fresh.

02:10There is some salt in it, but usually not enough to make it undrinkable.

02:16But when this mixed rainwater makes its way to the ocean,

02:22over there some of the dissolved minerals such as calcium

02:26are extracted from the water by the organisms through a biological process.

02:32But salt tends to remain, thus making the water undrinkable and salty.

02:40But not only that, another factor responsible for turning the oceanic water salty

02:47is hydrothermal fluids which come from vents in the sea floor.

02:52You see, when the salted ocean water seeps into cracks in the sea floor,

02:58over there it gets heated by magma from the Earth's core.

03:03This heat causes a chain of chemical reactions

03:07and the water tends to lose Oxygen, Magnesium and Sulphates

03:12and pick up metals such as Iron, Zinc and Copper from surrounding rocks.

03:19The heated water is released through vents in the sea floor,

03:23carrying the additional metals with it and as a result the ocean water gets saltier.

03:32I know what you guys are thinking, but why aren't lakes and rivers salty?

03:38Well, these water bodies have some amount of salt in them too.

03:43But as they are continually flowing, it's hard for the salt to get accumulated

03:49and get carried away into the ocean, rubbing most salt into its wound.

03:56But remember, this salted water is home to many aquatic animals and plants

04:03and plays a massive role in the existence of our Earth.

04:08So, we need to make sure to keep our oceans clean and free from any pollution.

04:16TRIVIA TIME!

04:19Did you know, two of the most common minerals in the ocean

04:23and two of the most common minerals in seawater are Chloride and Sodium?

04:29Yes, together they make up around 85% of all dissolved minerals in the ocean.

04:38Hope you learned something new in today's episode.

04:41Until next time, it's me, Dr. Binocs, Zooming out!

04:46Aww, never mind!

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