''They are formed from the accumulation of materials derived from other rocks which have been cemented together this is a description of

The given description is a characteristic of "mechanically formed sedimentary rocks". These rocks are formed from the accumulation of sediments or fragments of other rocks that have been mechanically weathered and eroded, and then transported by water, wind, or ice to a new location. The sediments are then deposited and compacted, and often cemented together by minerals such as silica, calcium carbonate, or iron oxide, forming a solid rock. Examples of mechanically formed sedimentary rocks include sandstone, shale, and conglomerate, which are made up of grains of sand, clay, and pebbles, respectively. Metamorphic rocks are formed from existing rocks that have been subjected to high temperatures and pressures, causing them to change in composition and texture. Plutonic rocks are igneous rocks that solidified from magma deep within the Earth's crust. Organically formed sedimentary rocks are formed from the accumulation of organic matter such as shells or plant material. Volcanic rocks are igneous rocks that solidified from lava or magma on the Earth's surface.