Why cant you get direct information about interior of earth?

What do cellular rrespiration and fermentation have in common? Fictional martian channels imagined by percival Lowell? When are the 5 prayer times? You have been a great foil to you. what does that mean? What are the different solutions found in home and environment? How much sugar did Morgan consume in 30 days? How did sargon the great die? Where does bacteria grow? Is matter in the plasma state common in the Earth? What are the causes the concequences of study? Definition of neutralism and its example? What are all the living components of the environment such as plants and animals referred to as? What kind of tissue gives an organism to ablity to move? Do all plants have a vascular system? Is a case of genetic drift in which rare alleles or combinations of alleles occur in higher frequencies in a population isolated from the general population? In march of 1889 this ship was responsible for one of the worst enviormental disasters ever? Why does a liquid's rate of evaportion increase when the liquid isheated? Are there hurricanes in December? What is a seed appendage? How far is rigel from altair?

Why cant you get direct information about interior of earth?