A quick learning for kids, along with lots of fun and joy. If you like the work please like and subscride the channel. Your appreciations are much needed
Category
📚
LearningTranscript
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!