AP Board 7th Class Social Studies Notes Chapter 4 Oceans and Fishing

Students can go through AP State Board 7th Class Social Studies Notes Chapter 4 Oceans and Fishing to understand and remember the concept easily.

AP State Board Syllabus 7th Class Social Studies Notes Chapter 4 Oceans and Fishing

→ The earth is known as a watery planet as it is the only planet containing water in abundance. & It is estimated that about 71% of the earth’s surface is occupied by seas and oceans.

→ An extension of saline water on earth is called the sea.

→ Large sea areas are called oceans.

→ Oceans are huge bodies of water generally separated by continents.

→ The floor of the ocean is just like the surface of the earth.

→ The bottom of the sea is not a flat surface.lt consists of hills, mountains, plateaus, plains, trenches, etc.

→ The waters of the oceans are never still.

→ Ocean waters have three kinds of movements. They are:

  1. Waves,
  2. Currents,
  3. Tides. & Streams that flow constantly in a definite direction on the surface of the ocean are called ocean currents.

→ The ocean currents are of two types – the warm currents and the cold currents.

→ Tides are the rhythmic rise and fall in the level of the water in the oceans every day.

AP Board Solutions AP Board 7th Class Social Studies Notes Chapter 4 Oceans and Fishing

→ Tides do not rise to the same height every day.

→ Ocean water is always saline. It contains Several mineral salts dissolved in it.

→ The oceans are the main source of rainfall.

→ Oceans are storehouses of fish and other seafood.

→ They are the main source of salts.

→ Oceans provide natural highways for international trade.

→ The fishermen have a special tool kit for repairing the nets which consist of Nulukarralu Nulukanda and a flattened stick that determines the net ring size.

→ The village soil is mainly loamy and rice is the principal crop grown on it.

→ A large number of people of Bhavanapadu worship Gangamma, Gowri, and Shiva

→ Tool kit: The fishermen have a special tool kit for repairing the nets which consist of Nulukarralu (net repairing fork) N.ilukanda (thread) and a flattened stick that determines the net ring size.

→ Kannulu: Nets are of different types based on different sizes of the Kannulu, (Rings) and layers of the net.

→ Burra Katha: There is an open stage where the Burra Katha is performed There are three members on the stage One among them tells a story, others follow him by imitating It is a famous technique

→ Mechanical Boat: Compared to the Karrateppa there is far more risk of life in Marapadava (Mechanicál boat) because it goes far into the sea.

AP Board Solutions AP Board 7th Class Social Studies Notes Chapter 4 Oceans and Fishing

→ Salinity: Containing salt or salts.

→ Waves: When the water on the surface of the ocean rises and falls they are called waves.

→ Currents: In the oceans, water is found to move from one part to another in big streams.

→ Tides: Tides are the rhythmic rise and fall of the water in the oceans every day

→ Warm currents: The warm currents flow from the equatorial region towards the poles

→ Cold current: The cold currents flow from the poles towards the equatorial regions.

→ Karrateppa: It is a country-made boat which goes up to 5 km into the sea and brings small catches of fish.

→ Marapadava: It goes far into the sea and it is difficult to swim over to shore in times of trouble.
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