Q.1 : What is Lithosphere ? What does it
comprise of ?
Ans : The solid portion of the earth in which we live is called lithosphere . It comprises the rocks of the earth's crust and the thin layer of soil that contain nutrient elements which sustain organisms .
Q.2 : What are the two main divisions of
Earth surface ?
Ans : The two main divisons of earth surface are - continents and ocean basins.
Q.3 : Why is Earth called blue planet?
Ans : The Earth is called blue planet because more than 71% of the earth is covered with water .
Q.4 : What is global warming?
Ans : Carbon dioxide is an important constituent of air . But increase in the amount of carbon dioxide lead to increase in global temperatures as carbon dioxide absorbs heat . This is termed as global warming .
Q.5 : Name some ways in which air get polluted?
Ans : Air gets polluted with emission from
industries , thermal power plants and vehicles.
Q.6: Name the continents that surround the
Pacific ocean?
Ans : The continents that surround the
Pacific ocean are - Asia , Australia , North America and South America.
Q.7 : Name the research stations of India
located in Antarctica?
Ans : Maitri , Dakshin Gangotri
Q.8 : What are four major domains of the earth ?
Ans : The four major domains of the earth are - Lithosphere , atmosphere , hydrosphere and biosphere.
Q.9 : What is the importance of 'biosphere'?
Ans : Biosphere is the narrow zone of contact between land,water and air . It is in this zone that life , that unique to Earth exists. All the living organisms including humans are linked to each other and to the biosphere for survival .
Q.10: Identify the main gases and their percentage in the atmosphere?
Ans : The atmosphere is composed of nitrogen 78% , oxygen 21% and other gases such as carbon dioxide and argon that comprise 1% by volume.
Q.11: What is Marina Trench ? Where it is located ?
Ans : Marina Trench is the deepest part of the earth . It lies in the Pacific Ocean.
