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course, unknown. Probably it is small, but any such effect would bring the composition of the deeper parts of the Earth closer to that of olivine.The compressibility of a sample of tachylite (basaltic glass) was also measured and found to be 1.45 X 10-6 per megabar. The velocity of longitudinal waves in this material is calculated to be 6.45 km./sec., while the velocity in a holocrystalline rock of the same composition would be 6.9 km./sec.

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