The major rocks of Earth's crust are classified into three principal types based on their origin and appearance. Rocks in pure terms of geology can be defined as naturally occurring and coherent aggregate of one or more minerals.
Rocks are commonly divided into three major classes according to the processes that resulted in their formation. These three classes are-
- Igneous Rocks: Igneous rocks are those which have been formed from molten lava
- Sedimentary Rocks: Sedimentary rocks consists of fragments derived from preexisting rocks or of materials precipitated from solutions.
- Metamorphic Rocks: Metamorphic rocks are those that have been derived from either igneous or sedimentary rocks under conditions that caused changes naturally and over time.
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