Question

Ocean water is salty. Give reason. (note: this ans. should be for class7 and please don't spam out)​

Answer 1

Answer:

Rivers discharge mineral-rich water to the oceans. Satellite view of La Plata River discharge to the Atlantic Ocean. One way minerals and salts are deposited into the oceans is from outflow from rivers, which drain the landscape, thus causing the oceans to be salty.

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Answer 2

Ocean water is salty primarily due to the presence of dissolved salts and minerals. The main reason for the saltiness of ocean water is the process of erosion and weathering that occurs on land.

1. Erosion and Weathering: Over millions of years, water from rain, rivers, and streams flows over rocks, minerals, and soil on land. This water carries small particles, including salts, minerals, and other dissolved substances, along with it. These particles are then deposited into the oceans through various water bodies.

2. Volcanic Activity: Volcanic eruptions also contribute to the saltiness of ocean water. Volcanic activities release minerals, including salts, into the air and water, which eventually find their way into the oceans.

3. Underwater Geothermal Vents: Underwater geothermal vents, also known as hydrothermal vents, are openings on the seafloor where hot water and minerals are released from the Earth's crust. These vents also introduce salts and minerals into the ocean water.

4. Dissolved Salts: Once the salts and minerals reach the ocean, they dissolve in the water, leading to its saltiness. The most abundant dissolved salt in seawater is sodium chloride (common table salt), but there are also traces of other salts, such as magnesium, calcium, and potassium.

5. Evaporation: As water from the oceans evaporates under the sun's heat, the dissolved salts are left behind, causing the remaining water to become even saltier. This process is particularly prominent in areas with high evaporation rates, such as the Red Sea and the Dead Sea.

Overall, the combination of erosion, volcanic activity, geothermal vents, and evaporation contributes to the saltiness of ocean water, making it a unique and essential characteristic of our planet's vast bodies of water.

OR,

Ocean water is salty because of the presence of dissolved salts. These salts come from different sources. When it rains, water flows over rocks, soil, and minerals on land, carrying tiny particles with it. These particles, including salts, get carried into rivers and eventually into the oceans.

Volcanic eruptions also release minerals and salts into the air and water. Over time, these substances find their way into the oceans. Additionally, there are underwater vents on the ocean floor called hydrothermal vents, where hot water and minerals are released. These vents contribute to the saltiness of the ocean water as well.

The water in the ocean contains dissolved salts like sodium chloride (table salt) and other minerals like magnesium, calcium, and potassium. As the sun heats up the ocean, some of the water evaporates, leaving the salts behind. This process makes the remaining water even saltier.

So, the combination of erosion, volcanic activity, underwater vents, and evaporation causes ocean water to become salty. It's important to note that while the ocean is salty, freshwater sources like rivers and lakes have a much lower salt content.