1.The sediments in sedimentary rocks may be made of fragments of other rocks, organic remains, or
chemical precipitates.
2. The layer on top is younger than the layer on bottom.
3. Each layer represents a time when sediments were put down; layers of different colors just mean that
sediments of one time varied from sediments of another time in the composition.
4. Sediments lithify by cementation and compaction. Cementation occurs when substances crystallize in
between the spaces of sediment particles. Compaction occurs when sediments are squeezed together by
the pressure of materials on top of them.
5. Coal is a bioclastic sedimentary rock.
6. Sandstone is made up of sand-sized sediments. These sediments have spaces between sediment grains,
which allow water to flow through.