How did scientist determine that the outer core is a liquid? A. scientist have drills that can travel down to each core layers b. scientist use sonar c. by studying volcanic activity d. certain seismic waves that travel only through solids produce shodow zones in different parts of the globe

What types of jobs typically are found in ghetto, inner-city neighborhoods? a. low-wage positions, typically in retail outlets, that require little education b. professional positions with banks, doctors' offices, and other similar businesses c. hourly factory and manufacturing positions d. positions that require advanced education, such as those in financial or technology firms select the best answer from the choices provided.