Which of these materials if found in permeable rock metal sand stone diamond.

Which of the following statements is not true? • a. covalent compounds have low melting and boiling points. • ob. covalent bonds between atoms of a compound are relatively weak compared to bonds between molecules. • c. covalent bonds occur between nonmetals. • d. covalent compounds are often gases or liquids.

Which type of stress results when two plates push against one another? a. compression b. tension c. force d. shear

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust