A man suffering from anaemia feels tired after a short work. Explain.
What is mineral oil?
How do we determine the age of fossil?
Which one of the following is not a fossil fuel?
What is the worst quality of coal?
Which one of the following is not the evidence of evolution?
Which elements are found in coal?
What is called for the study of fossil?
Which era are important for the development of life?
In how many groups, geologists divided the history of earth.