Question

how earthquakes show us the inside of the earth
scienceprimer
multiple - choice question
the refraction patterns of p - waves indicate that
the core is one uniform ball of liquid
the core has at least distinct layers
there is a solid inner core inside the liquid outer core
rewatch

Explanation:

P - waves (primary waves) are seismic waves. When they pass through different - density or different - state materials (such as from liquid to solid or vice - versa), their refraction patterns change. If the core were a uniform ball of liquid, the refraction pattern of P - waves would be relatively simple. But the complex refraction patterns of P - waves suggest that the core has at least distinct layers. The fact that there is a solid inner core inside the liquid outer core is a more specific conclusion that can be drawn from more detailed analysis of seismic wave data (including not only refraction but also reflection and other properties), and the refraction pattern alone is more indicative of layered structure rather than the specific solid - liquid - core relationship.

Answer:

the core has at least distinct layers