what is para ocean and fishing 7th class test book
Answers
The floor of the ocean is just like the surface of the earth. The bottom of the sea is not a flat surface. It consists of hills, mountains, plateaus, plains, and trenches etc. many trenches on the ocean floor are so deep that even if the Mount Everest is placed in them, it will drown completely. A major part of ocean floor is about 3-6 kms below the sea level.
The water of the oceans are never still. There are different kinds of movements in them. Ocean water has three kinds of movements they are:
1) Waves: When the water on the surface of the ocean rises and falls, they are called waves. They are formed when gentle s=winds scrape across the ocean surface. The faster the wind, the bigger will be the waves.
2) Currents: In the oceans, water is found to move from one part to another in big streams. These streams which 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. The warm currents flow from the equatorial region towards the poles to towards the equatorial regions. These are mainly caused by the prevailing winds, differences in temperature and salinity of the ocean water.
3) Tides: Tides are the rhythmic rise and fall of the water in the oceans every day. All places on the coast experience some hours of low tide and some hours of high tide. Tides do not rise to the same height everyday. When the tide is high, water comes up to the coast for some distance. Then as low tide begins, the water moves back from the land. The tides are of great help to finishing. Tides at some places take away the mud brought down by rivers and prevent silting.
FISHING
Ocean water is always saline. It contains several mineral salts dissolved in it. The oceans are the main source for rainfall. Oceans are the store houses of fish and other sea foods. They are the main source of salts. Oceans provide natural high ways for international trade. Let us visit Bhavanapadu, a fishing village near the coast of Andhra Pradesh and stury the life of people living near the ocean.
It is four in the morning. Appalakonda’s wife wakes him up and give him some rice gruel to eat, by 5.00 am; Appalakonda is ready to go out to the sea. His friends wait for him on the beach. All of them are poor fishermen. They don’t own any boats or nets. They work on the Tata Rao’s mechanical boat. They are altoghter 20 members on a boat. Tata Rao too joins them and works along with them. The boat has already been made ready the day before, with all the necessary things properly loaded.
Before launching into the sea they check the engine the rope puller, the additional stock of diesel and also put their food packages down. They pray to the goddess in whom they have a strong faith.