Questão | Responda |
Sedimentary Rock = | Began as sediment usually on seabed. |
1) | River transports rock. |
2) | Deposits rock at lake/sea. |
3) | Builds up in layers: sediments. This is known as SEDIMENTATION. |
4) | Weight of sediments compact bottom sediments. |
5) | Water is squeezed out and crystals are formed. |
6) | Crystals glue pieces of rock together: CEMENTATION. |
7) | Takes millions of years. |
Examples | e.g. limestone & chalk=calcium bicarbonate from plant & animal remains. Sandstone & clay - compressed |
Characteristics | layer appearance - strata may contain fossils |
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