Question

why is it difficult to study the formation of earth and its structure

Answer 1

if we go on digging we may study the formation of earth but we cant go on digging as temperature and pressure increases which we cant bear.

Answer 2

It took us years of scientific investigation and analysis of data to form an understanding of the interiors of the Earth . The main reason for this is that even the deepest mines we have dug do not go beyond a few kilometers under the surface while the radius or the distance to the centre of the earth is over 6000 kilometers .