Which of these is metamorphic rock formed from limestone?
a. shale
b. clay
c. sandstone
d. marble

The correct answer is option D - Marble.

The marble is a metamorphic rock that forms when limestone is under the heat and pressure of metamorphism. It is composed mainly of the mineral Calcite and it generally contains other minerals such as quartz, graphite, micas, etc.

Besides, the characteristics swirls of the colored marbles varieties are usually the result of the mixture of various mineral impurities such as sand or iron oxides.

Marble is commonly used as a building material and for sculpture.

answer; dead end or culdesac;

answer; ///he could not explain why the continents drifted;