By reviewing Kerala Syllabus SCERT Class 6 Social Science Solutions Chapter 10 Through the Oceans Important Questions, students can improve their conceptual understanding.
Through the Oceans Extra Questions and Answers Class 6 Social Science Chapter 10 Kerala Syllabus
Through the Oceans Class 6 Important Questions
Question 1.
Water is one of the major components that retains life on the earth.
(a) Which are the two sources of water? Explain.
Answer:
Surface water sources are found on the surface of the earth, underground sources are found just beneath the surface, inside the earth,
(b) What percentage of the Earth’s surface is covered with water?
Answer:
Seventy one percent
Question 2.
(a) Inspite of continuous usage by living beings, why doesn’t the water run out?
Answer:
As a result of circulation of water (water cycle) in the hydrosphere water in the water sources do not get depleted despite its use.
(b) Choose the correct statement related to Hydrosphere?
A. Total mass of water found in the earth’s surface, interior and atmosphere in solid, liquid and gaseous state.
R. The layer of air that surrounds the Earth.
C. The solid rocky portion of the Earth.
D. All living organisms found on Earth.
Answer:
A. Total mass of water found in the earth’s surface, interior and atmosphere in solid, liquid and gaseous state.
Question 3.
The water cycle keeps water moving around the Earth in a continuous loop.
(a) Define Water Cycle.
Answer:
Water cycle is the continuous circulation of water on the earth, under its surface and in the atmosphere
(b) Explain its circulation
Answer:
The different sources of water on the earth turns into vapour through evaporation. The vapour thus formed becomes clouds through condensation. In addition to clouds, fog and dew are other forms of condensation. Water droplets from the clouds reach the earth, through precipitation.
Question 4.
Observe the given picture.
(a) Explain the distribution of water based on the given picture.
Answer:
97% of water on earth is saline water. Only 3% of total water on earth is fresh water. A major quantity of this fresh water lies frozen in ice sheets and glaciers. Hence, very limited amount of fresh water is available for living beings.
Question 5.
Oceans play a vital role in sustaining life on earth,
(a) Define Oceans,
Answer:
Oceans are vast water bodies that are situated among continents.
(b) Write the parts of Oceans,
Answer:
Seas and bays are parts of oceans.
(c) W hat is the scientific study of oceans called?
Answer:
Oceanography
Question 6.
What is the use of studying Oceanography?
Answer:
Oceanography helps in understanding the complex movement of water in oceans. Moreover, the study helps in addressing challenges like climate change, ocean pollution and depletion of biodiversity.
Question 7.
Ocean day reminds us of the need to conserve oceans.
(a) When is World Ocean Day celebrated annually?
(b) W’hat is its main objectives?
Answer:
(a) June 8
(b) The main objective of this day is to realise the importance of oceans in our life. The unscientific intervention of human beings affects the marine habitat adversely.
Question 8.
Match the following
| A | B |
| Sea | A strait is a narrow strip of water that connects two seas or oceans and is located between land areas. |
| Bay | A part of ocean that is partially surrounded by land is called a sea. |
| Strait | A bay is a part of the ocean that extends into the land. |
Answer:
| A | B |
| Sea | A part of ocean that is partially surrounded by land is called a sea. |
| Bay | A bay is a part of the ocean that extends into the land. |
| Strait | A strait is a narrow strip of water that connects two seas or oceans and is located between land areas. |
Question 9.
There are five main oceans on Earth.
A. Oceans and their characteristics are given in jumbled order. Write them in correct.
| Oceans | Features |
| A Pacific Ocean | i. It appears like the letter ‘S’ in the English alphabet. |
| B The Atlantic Ocean | ii. About one third of the earth’s surface is covered by this ocean. |
| C Indian Ocean | iii. This ocean shares its borders with all the oceans except the Arctic Ocean. |
| D The Southern Ocean | iv. The Bay of Bengal and the Arabian Sea are its parts |
(a) A -iii, B -iv, C -I, D -ii
(b) A – ii, B -1, C – iv, D – iii
(c) A -iv, B -iii, C -1, D -ii
(d) A -I, B -iv, C -ii, D – iii
Answer:
(b) A -ii, B -I, C -iv, D – iii
(B) Which among the following statements is not correct about the Arctic Ocean? Write them.
(a) It is situated mostly within the Arctic Circle.
(b) It is the smallest and shallowest ocean.
(c) Java Trench is the deepest part in this ocean.
(d) This area is mostly frozen throughout the year.
Answer:
(c) Java Trench is the deepest part in this Ocean
Question 10.
(a) The concepts related to Oceans are given below. Identify the Ocean and write the names.
i. Largest and Deepest Ocean.
ii. The Oceanic ridge called the Mid-Atlantic Ridge situated in the middle of the Ocean.
Answer:
i. Pacific Ocean
ii. The Atlantic Ocean
(b) Who gave the name ‘Pacific’ to the Pacific Ocean?
i. Christopher Columbus
ii. Vasco da Gama
iii. Ferdinand Magellan
iv. Marco Polo
Answer:
iii. Ferdinand Magellan
(c) What does the term ‘Mar Pacifico’ mean?
Answer:
Peace
Question 11.
Complete the table related to the main processes involved in the circulation of water.
| A | B |
| Evaporation | (a) _______ |
| (b) _________ | The process by which water vapour in the air cools to form water. |
| Precipitation | (c) _______ |
Answer:
(a) The process by which a liquid changes into gaseous form with the help of heat.
(b) Condensation
(c) The process by which water particles fall on earth as the clouds cannot hold it further, due to its increased weight and size, as a result of continuous condensation.
Question 12.
There are several factors that influence the movement of ocean water.
(a) Explain the given Ocean Movements.
i. Waves
ii. High tides and low tides
iii. Ocean currents
Answer:
- Waves are movements created by the wind on the surface of the ocean.
- High tides and low tides are phenomena of rising and falling of sea level at fixed intervals. The rise in the sea level is called a high tide and the fall is called a low tide.
- Ocean current is a phenomenon by which water flows through the ocean in a fixed direction through a fixed path.
(b) Write some of the reasons that influence Ocean currents.
Answer:
Wind, variations in the temperature and salinity of the ocean, and the rotation of the earth.
Question 13.
Why is seawater salty?
Answer:
Mineral salts are dissolved in water from all sources. But the amount of salts in seawater is comparatively high. That is why seawater remains salty. Salinity is the total amount of all the mineral salts dissolved in water.
Question 14.
Human beings have depended on oceans for their livelihood since ancient times.
(a) How do Oceans influence our lives?
Answer:
- Along with seafood, oceans provide other resources as well.
- Maritime transportation helps in maintaining international trade.
- The oceans play a significant role in regulating global warming and producing oxygen.
- Coasts are also popular tourist destinations,
(b) Oceans face several challenges. Write some of them.
Answer:
- Pollution
- Dumping of chemicals and other dangerous substances
Question 15.
It is essential to conserve the marine ecosystem, which is home to a great variety .of animals and plants ranging from micro-organisms to the blue whale.
(a) Write some ways to conserve Oceans.
Answer:
- Prevent plastic, chemicals etc., from reaching the oceans.
- Keep the coast free from pollution.
- Create awareness on conservation of ocean.
- Control unsustainable fishing.