1. Direct: surface rocks, mining, volcanism2. Indirect: pressure, density & temp changes; density & pressure increase with depth; meteorites; gravitational anomalies; seismic waves3. Average density of the whole earth is about 5.5 g/cm3

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1. 1. Direct: surface rocks, mining, volcanism
2. Indirect: pressure, density & temp changes; density & pressure increase with depth; meteorites; gravitational anomalies; seismic waves
3. Average density of the whole earth is about 5.5 g/cm3