This common misconceptions covers Common Misconceptions within Seismic Waves for GCSE Physics. Revise Seismic Waves in Waves for GCSE Physics with 13 exam-style questions and 15 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 9 of 14 in this topic. Use this common misconceptions to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 9 of 14
Practice
13 questions
Recall
15 flashcards
⚠️ Common Misconceptions
Misconception 1: "S-waves are blocked by the whole core"
S-waves are blocked by the liquid outer core only. The inner core is solid, but S-waves never reach it because they are already blocked at the outer core boundary. If the whole core were solid, S-waves would pass through it. The fact that they don't reach the far side is specifically evidence that the outer core is liquid.
Misconception 2: "P-waves travel in straight lines through Earth"
P-waves continuously refract (curve) as they travel through Earth because density changes gradually with depth. Their paths are curved, not straight. They also refract sharply at boundaries (like the core-mantle boundary). It is this combination of curving and sharp refraction that creates the P-wave shadow zone.
Misconception 3: "We can only tell two things about Earth's interior from seismic waves"
Seismic wave data tells scientists: (1) that the outer core is liquid (from S-wave shadow zone), (2) that the inner core is solid (from P-wave travel times), (3) the approximate depth of each layer (from when waves arrive), (4) the density of each layer (from wave speeds), and (5) changes in composition at boundaries.