a scientific study seeks to drill deep into the crust of earth but has difficulty designing a process that will work. why is it difficult to design machine to dig through the crust of earth?

by cartels in other countries, shipped by air, mail, or land. i cant really see your answer choices : /

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a