Hydrosphere 8th Notes KSEEB Social Science

→ Atmosphere is a layer of gases dust Particles and water vapour surrounding the earth.

→ The earth is popularly Called Blue planet or watery Planet.

→ About 71% of the total area of the earth or 361 million Sq K.M is covered by water.

→ The major water bodies of the world are the Pacific ocean, the Atlantic ocean, the Indian ocean and the Artic Ocean.

→ Oceans are deep and large expanse of water found between the continents.

Hydrosphere Class 8 Notes KSEEB 8th Social Science

→ A sea is a part of the ocean extended or projected Inland.

→ Gulf is a pari of an ocean or sea that penetrates into the land.

→ Bays are small semi-circular water bodies partially surrounded by land.

→ Strait: A Strait is a narrow strip of water body joining two large water bodies Ex. Palk strait, Strait of Gibralter.

→ Isthmus is a narrow stretch of land mass joining two large land masses.
Ex. Suez Canal between the Mediterranean sea and the Red Sea.

→ The ocean floor is divided into 4 major parts They are

  1. The Continental Shelf
  2. The Continental Slope
  3. The Deep sea Plains
  4. The Ocean deeps.

→ The ocean water has 3 types of movements. They are waves, currents and tides.

→ Factors that influence ocean currents are rotation of the earth, temperature, wind, salinity, Shape of the Landmarks etc.

Hydrosphere Class 8 Notes KSEEB 8th Social Science

→ South Indian ocean currents are Mozambique, Madagascar etc.

→ Tides are the periodic rise and fall in the sea or ocean level. High tide, low tide arc two types of tides.

KSEEB 8th Social Science Notes

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