* Sedimentary rocks form from the accumulation of sediments (like sand, mud, or the remains of organisms) that settle at the bottom of bodies of water like rivers, lakes, or oceans. These layers are compressed and cemented together over time, forming the rock.

Here's why the other options are incorrect:

* Igneous rocks form from the cooling and solidification of molten rock (magma or lava). They don't form in layers.

* Metamorphic rocks form when existing rocks (igneous, sedimentary, or other metamorphic rocks) are transformed by heat and pressure. While they can sometimes show layering, it's not a defining characteristic like in sedimentary rocks.