Why is the scientist interested in studying in earth layers?

What is soil creep and what thing is important in soil creep? Is nitrogen found in the earths atmosphere? How much of the earth does taiga cover? What are anomalies? What process indirectly removes carbon from the earth's atmosphere? When an ice age ended the land once covered by ice was mostly? Can a mineral be made of one element? How do changes in the circulation of ocean currents affect climate? Is A thick mass of tough roots called loess kept the fertile soil of the prairies in place and held on to moisture? Why sodium and potassium lie in the same group? Is wind formed by air masses that meet? Is sulfur a good insulator of electricity? How many electron containing orbitals does iodine have? What are the two products when liquid bromine is added to calcium iodide? Where are Oxygen Silicon and Aluminum found in the earth? What are the waves that travel up and down? How do you fix toxic soils? What is 19 degrees Celsius equal to in Fahrenheit? Who is the father of geothermal energy? what is a good sentence for funnel cloud?

Why is the scientist interested in studying in earth layers?