دانلود نمونه سوال درک مطلب آزمون MSRT+پاسخنامه و جواب های صحیح

دانلود نمونه سوال درک مطلب آزمون MSRT+پاسخنامه و جواب های صحیح

The Earth comprises three principal layers : the dense, iron-rich core, the mantle made of silicate rocks that are semimolten at depth, and the thin, solid-surface crust. There are two kinds of crust, a lower and denser oceanic crust and an upper, lighter Line continental crust found over only about 40 percent of the Earth's surface