Which evidence recorded at seismic stations following an earthquake supports the inference that earth’s interior changes from solid rock to molten iron and nickel at the mantle-core boundary?

During an earthquake, waves radiate out spherically from the epicenter and reach the surface. There is usually a shadow zone on the earth's surface approximately 104 to 140 degrees of angular distance above the epicenter of the earthquake where no waves are recorded by seismographs. This is because P-waves are refracted by a liquid medium during transmission in the liquid outer core while S-waves cannot transmit through a liquid medium. This means that the interior outer core of the earth is molten.

solute : a solute is a substance that is dissolved in another substance is known as a solvent. it is mixed with a special mixture know as homogeneous mixture.

solvent: a solvent is a substance that dissolved a solute, which results in a solution is known as solvent.

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.