Which rock was subjected to intense heat and pressure but did not solidify from magma?

The correct answer is:

Metamorphic rocks

Explanation:

Metamorphosis is the difference that succeeds when rocks under the earth's surface are measured by total heat and pressure, manipulating them into metamorphic rocks. A metamorphic rock is a result of a reduction of a pre-existing rock. The fundamental rock is constrained to very great heat and pressure, which create obvious physical and/or chemical changes. Representatives of these rock types combine marble, slate, gneiss, schist.

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

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