Question

what did s-waves help scientists figure out about the inner structure of our planet?
a s-waves proved that the outer core is liquid because s-waves cannot pass through solids
b s-waves proved that the outer core is liquid because s-waves cannot pass through liquids
c s-waves proved that the inner core is liquid because s-waves cannot pass through solids
d s-waves proved that the inner core is liquid because s-waves cannot pass through liquids

Explanation:

To solve this, we recall the properties of S - waves (shear waves) and Earth's core structure. S - waves cannot travel through liquids. The outer core of the Earth is liquid. Let's analyze each option:

• Option A: Says S - waves can't pass through solids, which is wrong (S - waves can pass through solids).
• Option B: Correctly states that S - waves can't pass through liquids, and since S - waves don't pass through the outer core, it shows the outer core is liquid.
• Option C: The inner core is solid, and the reason given (S - waves can't pass through solids) is incorrect.
• Option D: The inner core is solid, and the statement about the inner core being liquid is wrong.

Answer:

B. S - waves proved that the outer core is liquid because S - waves cannot pass through liquids.