Cambridge Lower Secondary Checkpoint Science: Earth, Space, and Science in Context

Earth and Space plus Science in Context

Question 1 of 30

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Earth structure (evidence-based inference):

A seismograph station records two main waves from the same earthquake. The P-waves arrive first. The S-waves are detected at a nearby station but are not detected at a station on the opposite side of Earth.

Which conclusion is best supported by this pattern?

Select one option.

Both the mantle and the core are completely solid.
Earth's crust is liquid but the mantle is solid.
Earth has a liquid layer deep inside that blocks S-waves.
S-waves travel faster than P-waves through all materials.
The absence of S-waves proves that earthquakes only happen in oceans.

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