Mass of the Earth and Questions
How close can we get to the Center of the Earth?
Seismograph:S, P and Surface Waves
Question:Why liquid and solid core?
What seimic waves can teach us
Temperature and Pressure in the Center of the Earth
The image below (from Scripps Oceanographic institute) shows the depth of the sea floor. Mid-ocean ridges can be clearly seen.
Evidence for Plate Tectonics: Magnetic Stripes of the Sea
