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Home » Book Back Question and Answers » Samacheer Kalvi 5th Social Science Books English Medium Our Earth

Samacheer Kalvi 5th Social Science Books English Medium Our Earth

Social Science : Term 1 Unit 1 : Our Earth

Unit 1

OUR EARTH

Imayan is waiting for his father in the evening, after returning from school. His father is an employee in a reputed bank

Imayan: Come Daddy! (Imayan ran and hugged his father)

Father: what Imaya? Had your snacks?

Imayan: Yes, I had!

Father: What are you doing? Have you completed your homework?

Imayan: My social teacher told to draw solar system will you please help me?

Father: Yes Sure.

Imayan: She is going to teach about Earth tomorrow. She told to gather information about earth. Please tell me about that dad.

Father: Oh! Ok. I will tell you.

Imayan: How did the earth originate?

Father: Millions of years ago an explosion called the big bang occurred.Numerous stars and celestial bodies came into existence by that massive explosion. These celestial bodies together called the Universe. It is also referred to as cosmos.

Imayan: Will you explain about Universe, Daddy?

Father: The Universe is a vast expanse of space. The Universe consists of billions of galaxies, stars, planets, comets, asteriods, meteoroids and natural satellites. The exact size of the universe is still unknown. Scientists believe that the universe is still expanding outward.

Imayan: What is the galaxy, daddy?

Father: Galaxy has a huge cluster of stars. Our galaxy ‘Milky way’ is one of the countless billions of galaxies in the Universe.

Imayan: Ok Daddy. What is Solar system?

Father: Solar system consists of the sun, the planets, their moons, dwarf planets, asteroids and comets. These objects are gravitationally bound.

Imayan: Very interesting dad. Tell me about our solar system.

Father: There are 8 planets in our solar system. The outer planets are Gaseous planets. They are Jupiter, Saturn, Uranus and Neptune. The inner -rocky planets are Mercury, Venus, Earth, and Mars. They are called Terrestrial planets. The frozen planets are Uranus and Neptune.

Activity

Make the Globe.

Imayan: Then, where is our Earth daddy?

Father: The Earth is the third planet from the sun and the fifth largest in the solar system

Imayan: It is said that the earth is rotating itself and at the same time revolving around the sun. Is it true?

Father: Yes, it has two movements. They are rotations and revolution. The earth rotates on its axis. It is called rotation of the earth. It also revolves around the Sun. It is called revolution of the earth. Day and night are caused due to the earth’s rotation. Seasons are caused by Earth’s revolution. Life is possible only on earth because of the presence of land, air and water.

Imayan: Oh! I see. What is the distance between the sun and the earth?

Father: The distance is nearly 150 million kilometre between the sun and the earth.

Imayan: Say some interesting facts about Planets dad?

Father: Mercury and Venus lie near the sun. Next to Earth is Mars, Jupitar, Saturn, Uranus and Neptune. The planets nearer to the sun are very hot. The planets away from the sun are very cold. Mercury is the smallest planet. Venus is called Earth’s twin. Mars is described as the Red planet. Earth is called the Blue planet. Saturn is the Ringed planet.

Imayan: Wow! Amazing! Where do we live on the Earth?

Father: We live on the surface of the Earth. It is made up of 7 continents and 5 oceans.

Imayan: 7 continents!! What are they?

Father: Listen. They are: Asia, Africa, North America, South America, Antarctica, Europe, and Australia.

Imayan: Which is the biggest continent?

Father: The Asian continent where we live is the biggest of all. And Australia is the smallest one. The Antartica is the continent full of snow.

Imayan: What are the five oceans Daddy?

Father: Pacific Ocean, Atlantic Ocean, Indian Ocean, Arctic Ocean and Southern Ocean. Do you know that around 97 percent of the planet’s water is in the Ocean?

Imayan: Is it so, Daddy?

Father: Yes, Around 71 percent of our Earth is covered by salt water and that is called as Ocean. Only 2.5 percent of water is fresh and 1 percent of it is easily accessible.

Imayan: Thank you, Daddy. Today I have learnt a lot about the earth from you. Now I am going to study and do my home work.

Father: Ok, Imaya. Go and study.

Do you know?

Birla Planetarium is located in Chennai which provides virtual tour of the night sky and planets of the solar system.

Evaluation

I. Fill in the blanks

1. The distance between the earth and the sun is 150 million kilometre.

2. Season are caused due to the revolution of the Earth.

3. The continent which is covered by ice is Antarctica.

4. The biggest continent is Asia.

5. Mars is described as Red Planet.

6.71 % Percentage of our earth is covered by salt water.

II. Match the Following

1. Smallest continent – Earth’s revolution

2. Blue planet – Australia

3. Neptune – Earth

4. Seasons – Earth’s rotation

5. Day and night – Farthest planet 

Answer:

1. Smallest continent – Australia

2. Blue planet-Earth

3. Neptune –Farthest planet

4. Seasons – Earth’s revolution

5. Day and night –Earth’s rotation

III. Answer the following:

1. What do you know about the universe?

The Universe is a vast expanse of space. The Universe consists of billions of galaxies, stars, planets, comets, asteriods, meteoroids and natural satellites. The exact size of the universe is still unknown. Scientists believe that the universe is still expanding outward.

2. Define solar system.

Solar system consists of the sun, the eight planets, their moons, dwarf planets, asteroids and comets. These objects are gravitationally bound.

3. How did the Earth form.

Millions of years ago an explosion called the big bang occurred. Numerous stars and celestial bodies came into existence by that massive explosion. These celestial bodies together are called the universe. It is also referred to as cosmos.

4. Distinguish between Rotation and Revolution.

The earth has two movements. They are rotations and revolution. The earth rotates on its axis. It is called rotation of the earth. It also revolves around the Sun. It is called revolution of the earth. Day and night are caused due to the earth’s rotation. Seasons are caused by Earth’s revolution.

5. How many oceans are there in the earth?

There are five oceans on earth. They are : Pacific Ocean, Atlantic Ocean, Indian Ocean, Arctic Ocean and Southern Ocean.

IV. Answer in detail

1. Write about the solar system.

There are 8 planets in our solar system. The outer planets are Gaseous planets. They are Jupiter, Saturn, Uranus and Neptune. The inner -rocky planets are Mercury, Venus, . Earth, and Mars. They are called Terrestrial planets. The frozen planets are Uranus and Neptune. 

2. Write about the Planet Earth in detail.

The Earth is the third planet from the sun and the fifth largest in the solar system. The earth has two movements. They are rotations and revolution. The earth rotates on its axis. It is called rotation of the earth. It also revolves around the Sun. It is called revolution of the earth. Day and night are caused due to the earth’s rotation. Seasons are caused by Earth’s revolution. Life is possible only on earth because of the presence of land, air and water. Earth is called the Blue planet. We live on the surface of the Earth. It is made up of 7 continents and 5 oceans. The continents are : Asia, Africa, North America, South America, Antarctica, Europe and Australia.

3. Explain about the continents.

The Earth consists of seven continents. They are : Asia, Africa, North America, South America, Antarctica, Europe and Australia. Asia is the biggest continent and Australia is the smallest one. Antarctica is a snow- covered land mass. 

VI. Activity:

1. Collect images on various types of planets.

2. On a world map mark the five oceans of the Earth.

3. On a world map mark the deserts and forests.

VII. Mapwork

Find the Continents and write their name in the world map.

Activity

Make the Globe.

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