What are the three classes of rocks?

The three classes of rocks are igneous, sedimentary, and metamorphic, which is why this answer is the most accurate.

Igneous rocks form from the solidification of molten material, either magma or lava. They can be classified into two main types: intrusive (or plutonic) rocks, which crystallize below the Earth's surface, and extrusive (or volcanic) rocks, which solidify at the surface.

Sedimentary rocks are created through the accumulation and compaction of sediments, which can originate from pre-existing rocks, organic matter, or precipitated minerals. They are often layered and can contain fossils, providing valuable insights into Earth’s history.

Metamorphic rocks are formed when existing rocks are subjected to high heat and pressure, causing them to undergo transformation in their mineral composition and structure without completely melting. This process results in a variety of textures and types, all derived from a parent rock.

In contrast, the other options refer to different characteristics or classifications that do not accurately represent the main geological categories of rocks. Granite, basalt, and limestone are specific types of rocks rather than classes, while organic, inorganic, and man-made classifications do not fit within the geological classification system. Similarly, hard, soft, and composite are