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What are rare earth metals?

The widest palette of rare-earth metals can be called rare only conditionally, since most of the elements known to science have already received quite wide application in modern technology, as well as in industry. But there are also metals that are very expensive. Their high price is caused by the following two factors:

by the minimum amount of these elements contained in the minerals of the earths crust.
by expensive technologies that are
used to extract them.

What is the purpose of their extraction?

The answer to this question is known to those who create and develop innovative devices with the help of which the continuous process of nanotechnology development is going on. Now, let us briefly tell about each of the elements and their properties.