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.

Answer the leaders serve as spokespersons for their party's positions on issues. ... Elected at the beginning of each Congress by members of their respective party conferences to represent them on the Senate floor, the majority and minority leaders serve as spokesmen for their parties' positions on the issues.

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