GCSE Physics - Seismic Waves #75

The video explains seismic waves, focusing on P waves and S waves. P waves are longitudinal and travel through solids and liquids, while S waves are transverse and only travel through solids. Seismologists use these waves to study Earth's internal structure. Waves can be reflected, absorbed, or refracted at boundaries, with refraction occurring due to changes in density. P waves can travel through the liquid outer core, but S waves cannot, providing clues about Earth's layers. The video highlights how wave detection helps scientists understand Earth's composition.

Explain the concept of refraction as it relates to seismic waves.

What was one of the main clues that led scientists to discover the existence of a liquid outer core?