An Earthquake is a vibration or oscillation of the surface of the earth caused by a transient disturbance of the elastic or gravitational equilibrium of the rocks at or beneath the surface.
Proper theory building, writing style, problem solving ability and
accuracy are very important to score well in the UPSC Physics exam. The books I referred for Physics are as follows. Here the books I did
thoroughly for a particular topic are underlined, while the
non-underlined books are those which I used to cover any remaining
sub-sections of the topic.
Book Lists for Optional Subjects of UPSC Civil Services Mains Examination (UPSC CSE) and other State PSC Exams.
Optional Subjects demand Many books because of their very nature
and vast syllabus. I have collected these books from various sources and have strictly complied the necessary books for various optionals for UPSC CSE and other State PCS Exams. Some of the State PSC have different syllabus but still their syllabus match 80-90% with UPSC syllabus so the book list remains almost same.