The End from the Beginning

Declaring the end from the beginning, and from ancient times the things that are not yet done, saying, My counsel shall stand, and I will do all my pleasure:

( Isaiah 46:10 ) KJV

This post is part of the WHY? daily devotional for September

If seismic P-waves can propagate through solid, liquid or gas, how do we know that there is a liquid outer core rather than a great gulf of open space in the P-wave shadow zone?

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