Earth's Layers Video This video goes over how we use seismic waves to determine the composition and depth of the layers (indirect evidence). It also does a nice job of reviewing each layer, it's depth and what it is made of. You can stop watching it at about the 4:30 mark.
Proof of the mantle's composition 30% of the mantle is composed of a mineral that was discovered over 100 years ago, and was just recently given a name!
Earth's Structure Stations
ALL Station Directions All station directions are in this document. We skipped station 5 entirely.
Station Keys These are here for your reference AFTER you have attempted answering the questions on your own according to directions. If you just copy these answers, you will learn nothing.