SSLC (English Medium) कक्षा ९ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Social Science

What role is played by NIO (National Institute of Oceanography)

What do you mean by the ocean salinity?

Abyssal plains in the Atlantic and Indian Oceans tend to be extensive than the Pacific Ocean. Why?

The ocean waters are saline in nature.

Explain the term

Continental Rise

Explain the term

Oceanic Ridge

Extensive deposits of Minerals and Mineral fuels are found in ______.

Consider the following statement.

1. Submarine Fans which are similar to the alluvial fans found in water.
2. Aquatic life has a very slow rate of metabolism.
3. Dragon Hole is the deepest known underwater sinkhole in the world.
4. Abyssal plains are usually covered by a thick layer of sediments. 

Which of the following correctly matched?

Assertion (A): Continental slope is free from deposits as they are steep.
Reason (R): Abyssal plains appear as a uniform flat and featureless plain.

Assertion (A): Continental shelf is almost a uniform zone of sea bed with gentle gradient.
Reason (R): This enables sunlight to penetrate through the water.

Assertion (A): Ocean currents are in clockwise motion in the Northern Hemisphere and in the anti-clockwise motion in the Southern hemisphere.
Reason (R): The movement of ocean currents from high latitudes to low latitudes is called warm currents.

Assertion (A): The ocean/seawater does not contains calcium in great quantities.

Reason (R): Many of the aquatic animals with shells use the dissolved calcium in the seawater to build their protective shells.

What is Dragon Hole?

Write a short note on the movement of the ocean water.

What is called continental rise?

How is the energy of the falling wave water used?

When was the National Institute oceanography established? What do they do?

What is Sea Mount?

Give reason for the following.

The earth is called the Blue Planet.