What are the common examples of metamorphic rocks?

Metamorphic rocks are formed under heat and pressure that alters pre-existing rocks, including sedimentary, igneous, or even other metamorphic rocks. The correct examples of metamorphic rocks include slate, gneiss, and marble.

Slate is formed from shale, a sedimentary rock, under high pressure and temperature conditions, and it is commonly used for roofing and flooring. Gneiss is characterized by its banded appearance and is formed from granitic rocks that have undergone metamorphism. Marble, on the other hand, originates from limestone and is prized for its use in sculpture and architecture due to its ability to take a high polish.

The other options include materials that do not fall under the category of metamorphic rocks. Instead, they consist of sedimentary or igneous rock types, which therefore do not illustrate the characteristics of metamorphism. Understanding these distinctions is crucial in identifying the classification of rocks in geology.