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The major discontinuity that occurs at a depth of 2,900 km below Earth's surface is the:
Vacuum Tubes
Electronic components used in the early 20th century for amplification, switching, and signal modulation, before the advent of semiconductors.
Auto Industry
This refers to the sector of the economy that designs, develops, manufactures, markets, and sells motor vehicles.
Public Domain
Refers to creative works that have no exclusive intellectual property rights. These works are available for public use without the need to obtain permission or pay royalties.
Copyright Laws
Legal regulations that protect the rights of creators over their original works, preventing unauthorized use.
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