Which characteristic is NOT typical of sedimentary rocks?

Sedimentary rocks are primarily characterized by their layered structure, which is the result of sediment deposition over time. They often contain fossils, providing important information about past environments and life forms. Additionally, these rocks typically form from the accumulation of sediments, such as mud, sand, gravel, and mineral fragments, which are compacted and cemented together over geological time.

The option selected as the correct answer highlights an important aspect of sedimentary rock formation: they do not originate from molten material. Instead, molten material is characteristic of igneous rocks, which form from the cooling and solidification of magma or lava. Thus, the characteristics of sedimentary rocks distinctly differ from those associated with igneous processes, making the formation from molten material not a typical feature of sedimentary rocks.