The Earth- Oceans and Continents - 1 Class 3 Worksheet SST

Q1: 

Fill in the blanks

(i) A model of the earth is called a _______.
(ii) A book of small maps is called an _______.
(iii) A _______ is a drawing of a part or whole of the earth.
(iv) A _______ is used to find directions.
(v) The needle of a compass always points to find _______ direction.
Ans: 
(i) A model of the earth is called a globe.

Globe(ii) A book of small maps is called an Atlas.
(iii) A map is a drawing of a part or whole of the earth.
(iv) A compass is used to find directions.

(v) The needle of a compass always points to find north direction.

Q2: 

Match the following

Ans:

Q3: Multiple Choice Questions (MCQs)

(i) The earth spins towards the
(a) North
(b) South
(c) West
(d) East
Ans: (d)
The Earth rotates from the west towards east.

(ii) Which is the largest continent on earth?
(a) Africa
(b) Asia
(c) Australia
(d) Europe
Ans: (b)
Asia is the largest continent and Australia is the smallest continent.

(iii) The air that we breathe comes from
(a) Sun
(b) Water
(c) Oxygen
(d) Atmosphere
Ans: (c)
These plants produce oxygen as a byproduct of photosynthesis.

(iv) Which ocean takes up about half of the earth’s surface?
(a) Atlantic
(b) Indian
(c) Pacific
(d) Arctic
Ans: (c)
Holding more than half of the Earth's open water supply, the Pacific Ocean was named by explorer Ferdinand Magellan in 1520, who called this body of water "pacific," due to the calmness of the water at the time.

Pacific Ocean

(v) One rotation of the earth takes a period of
(a) 12 hours
(b) 24 hours
(c) 6 hours
(d) 18 hours
Ans: (b)
The earth takes about 24 hours to complete one rotation around its axis. The period of rotation is known as the earth day.

Q4: Answer the following questions

(i) Name three factors that have made life possible on earth.
Ans: Factors responsible for life on earth are:

• presence of water
• suitable atmospheric condition
• presence of oxygen
• correct amount of sunlight

(ii) What is an orbit and what is its shape?
Ans: An orbit is a regular, repeating path that one object in space takes around another one. An object in an orbit is called a satellite. A satellite can be natural, like Earth (or) the moon (or) like some other planets also. Orbits come in different shapes. All orbits are elliptical, which means they are an ellipse, similar to an oval. For the planets, the orbits are almost circular.

(ii) Distinguish between rotation and revolution.
Ans: "Rotation" refers to an object's spinning motion about its own axis. "Revolution" refers to the object's orbital motion around another object. For example, Earth rotates on its own axis, producing the 24-hour day. Earth revolves about the Sun, producing the 365-day year.

Rotation and Revolution

(iii) Define ocean.
Ans: A very large body of water is called an ocean. The four main oceans of the world are the Pacific ocean, the Atlantic ocean, the Indian ocean and the Arctic ocean. The Pacific Ocean is the largest ocean and the Arctic Ocean is the smallest ocean.

(iv) How many continents are there? 
Ans: There are a total of 7 continents they are Asia, Africa, North America, South America, Europe, Australia, and Antarctica.