Q1. Answer the following questions briefly.
A) what are the four major domains of the earth?
Ans. Lithosphere, hydrosphere, atmosphere and biosphere.
B) name the major continents of the earth?
Ans. Asia, europe, africa, north america south america, australia and antarctica.
C) name the two continents that lie entirely in the southern hemisphere.
Ans. Australia and antarctica.
D) name the different layers of atmosphere.
Ans. Troposphere, stratosphere, mesosphere, thermosphere and exosphere.
E) why is the earth called the blue planet?
Ans. More than 71 percent of the earth is covered with water hence it is known as the blue planet.
F) why is the northern hemisphere called the land hemisphere?
Ans. The greater part of the landmass lies in the northern hemisphere hence it is called the land hemisphere.
G) why is the biosphere important for the living organisms?
Ans. Biosphere is important for the living organisms because there all essential elements of life land water and air are found.
Q2. Tick the correct answer.
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
Q3. Fill in the blanks.
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 support life.
D) the continents of europe and asia together are known as eurasia. E) the highest mountain peak on the earth is mt. Everest