Question

We know that Earth's outer core is liquid because...

a Both earthquake P-waves and S-waves are blocked from passing through it.
b The crust and mantle both float on top of it.
c Earthquake S-waves are blocked from passing through it.
d Earthquake P-waves are blocked from passing through it.

Answer 1

The answer would be C.

P waves can travel through both solid and liquids while S waves could only travel though solid.