What is the basis for classification of rocks into igneous,metamorphic,and sedimentary?
A) how old the rocks are
B) how the rocks formed
C) the types of minerals in the rocks
D) the grain size of the rocks

Question

Quizplus · Accepted Answer

The basis for classification of rocks into igneous, metamorphic, and sedimentary is how the rocks formed. Igneous rocks form from the solidification of molten rock, while metamorphic rocks form from existing rocks that were subjected to heat and pressure. Sedimentary rocks form from the accumulation and lithification of sediment. The age of the rocks, the types of minerals, and the grain size are factors that may be used to further classify each rock type.

What Is the Basis for Classification of Rocks into Igneous,metamorphic,and