How have seismic waves provided evidence about the structure of the Earth?
The waves are absorbed completely by the core, so no waves reach the far side.
The waves travel at exactly the same speed through every part of the interior.
The waves change speed and direction at boundaries inside the Earth, so detectors reveal them.
The waves travel only through the crust, so their arrival times give the depth of the crust.
40 exam-style questions on AQA GCSE Physics 6.1 Waves in air, fluids and solids, covering 6.1.1 Transverse and longitudinal waves, 6.1.2 Properties of waves, 6.1.3 Reflection of waves, 6.1.4 Sound waves (HT only), and 6.1.5 Waves for detection and exploration (HT only). Each one has a worked solution and a mark scheme showing where the marks go.