| A | B |
|---|
| sedimentary rock | rock made from layers of compressed sediment |
| silt | fine particles of sediment that are found at the bottom of a lake or river |
| sediment | solid particles that settle on the bottom of a river or lake |
| deposition | the process of laying down fine particles that may eventually solidify to produce rock |
| sedimentation | the process of deposited rock particles being built up in layers |
| compaction | the process by which sediment is decreased by being squeezed together by the weight of the layers above; this makes the rock less porous |
| cementation | the sticking together of sediment to form new rock |
| strata | layers of rock that have been built up over time |
| **limestone | type of sedimentary rock made of calcium carbonate and compressed remains of plants and animals |
| **chalk | type of sedimentary rock that contains almost pure calcium carbonate |
| **sandstone | type of sedimentary rock from compressed sand |
| **mudstone | type of sedimentary rock made of compressed flaky grains of clay and mud |
| **siltstone | type of sedimentary rock made of compressed silt |
| clay | made from compressed mud |
| **rock salt | rock made from compressed salt |
