The Earth- Oceans and Continents - 2 Class 3 Worksheet SST

Q1: Multiple Choice Questions (MCQs)

(i) What is the name of the family to which Earth and other planets belong?
(a) Lunar family
(b) Solar system
(c) Galaxy family
(d) Planetary group
Ans: (b)
Earth and other planets belong to the Solar system, along with the Sun.

(ii) Which ocean is known for having large chunks of ice called Icebergs?
(a) Pacific Ocean
(b) Indian Ocean
(c) Arctic Ocean
(d) Atlantic Ocean
Ans: (c)
Arctic Ocean is known for having large chunks of ice called Icebergs.

(iii) How many continents are there on Earth, including Eurasia?
(a) Six
(b) Seven
(c) Eight
(d) Nine
Ans: (b)
Earth is divided into seven continents, including Eurasia.

(iv) Which explorer proved that the Earth was round in shape by undertaking a sea journey?
(a) Christopher Columbus
(b) Ferdinand Magellan
(c) Marco Polo
(d) Vasco da Gama
Ans: (b)
Ferdinand Magellan proved that the Earth was round by undertaking a sea journey in the 16th century.

(v) What allows airplanes and Mount Everest's height to be measured from the same standard level?
(a) Sea level
(b) Mountain level
(c) Ocean level
(d) Continental level
Ans: (a)
The height of Mount Everest and airplane flights are measured from sea level.

Q2: Choose the right answer

(i) The ______ of the Earth’s surface is water. (two-fifths/three fourths)
(ii) The ______ of the Earth’s surface is land. (one-fifth/one-fourth)
(iii) The place where the land and the sky seem to meet is called _____ .(the horizon/ vertical)
(iv) The layer of air surrounding the Earth is called the _____ . (horizon/atmosphere)
Ans:
(i) three-fourth
(ii) one-fourth
(iii) the horizon
(iv) atmosphere

Q3: Name the following

(i) The three things which make life possible on the Earth.
(ii) The sailor who proved that the Earth is round.
(iii) The first two astronauts who landed on the moon
Ans:
(i) land,water,air.
(ii) Ferdinand Magellan.
(iii) Neil Armstrong and Edwin Aldrin

Q4: Fill in the blanks

(i) The shape of the Earth is ____ like a ball.
(ii) The Earth is called the ____ Planet.
(iii) The Earth is the only planet where there is ______.
(iv) The place where the land and the sea meet is called a ____.
(v) The height of Mount Everest is measured from __________.
Ans:
(i) round
(ii) Blue
(iii) life
(iv) coast
(v) sea level

Q5: True/False Questions

(i) Oceans and seas are separate bodies of water and are not interconnected.
Ans: False

(ii) Earth and Moon move around the Sun independently without any gravitational connection.
Ans: False

(iii) Continents are large unbroken landmasses, and Europe and Asia together are known as Eurasia.
Ans: True

(iv) Oceans cover more than half of the Earth's surface.
Ans: True

(v) The shape of the Earth was once believed to be flat until proved otherwise by explorers like Ferdinand Magellan.
Ans: True

Q6: Short Answer Questions

(i) Explain why the distance of Earth from the Sun is crucial for the existence of life on Earth.
Ans: The Earth's perfect distance from the Sun allows it to maintain a suitable temperature, supporting life. If Earth were too close, it would be excessively hot; if it were too far, it would be extremely cold. This optimal distance enables the existence of liquid water and fosters the growth of life forms on the planet.

(ii) Describe the role of Ferdinand Magellan in proving the Earth's round shape.
Ans: Ferdinand Magellan, in the 16th century, embarked on a daring sea journey and returned to the same starting point after three years. This journey proved that the Earth is round because if the Earth were flat, Magellan's expedition would not have led him back to his original location. His courageous journey provided evidence for the Earth's spherical shape.

(iii) Explain why sea level serves as the standard measurement for various heights and depths on Earth.
Ans: Sea level is considered the standard measurement for heights and depths because it provides a consistent reference point across the globe. Whether measuring the height of mountains like Mount Everest or the altitude of flying airplanes, using sea level as a reference ensures uniformity in measurements, allowing accurate comparisons and calculations.

(iv) Discuss the significance of oceans and their interconnectedness in the Earth's ecosystem.
Ans: Oceans cover more than two-thirds of the Earth's surface and play a vital role in regulating the planet's climate. They absorb heat, distribute it around the globe, and influence weather patterns. Oceans are interconnected, meaning that water levels in seas and oceans remain consistent. They are also essential for human activities such as trade, transportation, and recreation, making them crucial for the Earth's ecosystem and human civilization.