Question 1 Answer the following questions briefly.
(a) What are the four major domains of the earth?
(b) Name the major continents of the earth.
(c) Name the two continents that lie entirely in the Southern Hemisphere.
(d) Name the different layers of atmosphere.
(e) Why is the earth called the ‘blue planet’?
(f) Why is the Northern Hemisphere called the Land Hemisphere?
(g) Why is the Biosphere important for living organisms?
Answer
(a) The four major domains of the earth are :
1) Lithosphere
2) Atmosphere
3) Hydrosphere
4) Biosphere
(b) Major continents of the Earth
1) Asia
2) Europe
3) Africa
4) North America
5)South America
6) Australia
7) Antarctica
(c) Two continents lying entirely in the Southern hemisphere are:
1) Australia
2) Antarctica
(d) The different Layers of Atmosphere are :
1) Troposphere
2) Stratosphere
3) Mesosphere
4) Thermosphere
5) Exosphere
(e) The Earth is called the blue planet because it is the only planet (so far) which has water and it looks blue from the sky because of presence of water on it.
(f) The Northern Hemisphere is called the Land Hemisphere as greater part of the landmass lies in the Northern Hemisphere. It is more than 70% of the total area.
(g) The biosphere is important for living organisms as it contains 3 major elements important for life i.e. land , air and animal.
Question 2 Tick the correct answers.
(a) The mountain range that separates Europe from Asia is
(i) the Andes (ii) the Himalayas (iii) the Urals
(b) The continent of North America is linked to South America by
(i) an Isthmus (ii) a Strait (iii) a Canal
(c) The major constituent of atmosphere by percent is
(i) Nitrogen (ii) Oxygen (iii) Carbon dioxide
(d) The domain of the earth consisting of solid rocks is
(i) the Atmosphere (ii) the Hydrosphere (iii) the Lithosphere
(e) Which is the largest continent?
(i) Africa (ii) Asia (iii) Australia
Answer
(a) (iii) the Urals
(b) (i) an Isthmus
(c) (i) Nitrogen
(d) (iii) the Lithosphere
(e) (ii) Asia
Question 3 Fill in the blanks.
(a) The deepest point on the earth is _________ in the Pacific Ocean.
(b) The _________ Ocean is named after a country.
(c) The _________ is a narrow contact zone of land, water and air that supports life.
(d) The continents of Europe and Asia together are known as _________.
(e) The highest mountain peak on the earth is _________.
Answer
(a) The deepest point on the earth is Mariana Trench in the Pacific Ocean.
(b) The Indian Ocean is named after a country.
(c) The Biosphere is a narrow contact zone of land, water and air that supports life.
(d) The continents of Europe and Asia together are known as Eurasia
(e) The highest mountain peak on the earth is Everest.