Mendeleev periodic table was that he predicted new?

Mendeleev periodic table was that he predicted new undiscovered elements.

Explanation:

The first periodic table was proposed by Mendeleev and he placed the elements based on the mass and recurring properties of the elements, and he also left blank spaces for unknown elements, as he predicted few more elements will be discovered. He grouped similar elements together.

He predicted the discovery of Eka-boron, Eka-aluminium, Eka-manganese, Eka-silicon which were found to be Scandium, Gallium, Technetium and Germanium respectively.

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.