The Origin and Evolution of the Earth
1. Multiple choice questions.
(i) Which one of the following figures represents the age of the earth?
(a) 4.6 million years (c) 4.6 billion years
(b) 13.7 billion years (d) 13.7 trillion years
Answer:
(ii) Which one of the following is not related to the formation or modification of the present atmosphere?
(a) Solar winds (c) Degassing
(b) Differentiation (d) Photosynthesis Answer:
Answer:
(iii) Life on the earth appeared around how many years before the present?
(a) 13.7 billion (c) 4.6 billion
(b) 3.8 million (d) 3.8 billion
Answer:
2. Answer the following questions in about 30 words.
(i) What is meant by the process of differentiation?
Answer:
(ii) What was the nature of the earth surface initially?
Answer:
(iii) What were the gases which initially formed the earth’s atmosphere?
Answer:
3. Answer the following questions in about 150 words.
(i) Write an explanatory note on the ‘Big Bang Theory’.
Answer:
(ii) List the stages in the evolution of the earth and explain each stage in brief.
Project Work
(i) Which is the agency that has launched this project?
(ii) Why are scientists interested in collecting Stardust?
(iii) Where from the Stardust is being collected?
Answer: