Fill in the blanks to complete the passage. Geologists can use waves to learn about Earth’s interior. P waves travel faster than S waves. S waves travel through solids only, which tells geologists that the core is liquid. Geologists call the outer, solid area of Earth the crust; the next layer is the . Finally, at the very center, is the core.

What happens when an atom of sulfur combines with two atoms of chlorine to produce sci2? a. each chlorine atom shares a pair of electrons with the sulfur atom. b. an electron is transferred from each chlorine atom to the sulfur atom. c. an electron is transferred from the sulfur atom to each chlorine atom. d. each chlorine atom shares all its valence electrons with the sulfur atom.