Difference between revisions of "Sedimentary"
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: [[Sedimentary]] [[rock]]s are usually [[soft]] compared to other [[rock]]s. | : [[Sedimentary]] [[rock]]s are usually [[soft]] compared to other [[rock]]s. | ||
: They are made of rounded [[Grain (Rock)|grains]] held together by [[mineral]] salts. | : They are made of rounded [[Grain (Rock)|grains]] held together by [[mineral]] salts. | ||
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| + | ===Formation of Sedimentary Rocks=== | ||
| + | *[[Weathering]] - Rocks are broken down by the [[environment]]. | ||
| + | *[[Erosion (Rock Cycle)|Erosion]] - Wearing away rocks into smaller pieces. | ||
| + | *[[Transport (Rock Cycle)|Transport]] - Small pieces of rock are moved by rivers, glaciers and the wind. | ||
| + | *[[Deposition (Rock Cycle)|Deposition]] - When water and the wind slow down or when glaciers melt the small pieces of rock fall to the ground. | ||
| + | *[[Sedimentation]] - Layers of [[sediment]] (small pieces of rock) build up on lake beds and sea beds. | ||
| + | *[[Compaction]] - So many layers build up that the [[pressure]] squeezes all the water out. | ||
| + | *[[Cementation]] - [[Mineral]] salts that were [[dissolve]]d in the [[water]] fall out of [[solution]] and bind the [[sediment]] together. | ||
===Examples=== | ===Examples=== | ||
| − | === | + | {| class="wikitable" |
| + | |- | ||
| + | |[[File:Mudstone.png|center|200px]] | ||
| + | |[[File:Limestone.png|center|200px]] | ||
| + | |[[File:Sandstone.png|center|200px]] | ||
| + | |- | ||
| + | | style="height:20px; width:200px; text-align:center;" |[[Mudstone]] is formed from mud. | ||
| + | | style="height:20px; width:200px; text-align:center;" |[[Limestone]] is formed from the shells of dead sea creatures. | ||
| + | | style="height:20px; width:200px; text-align:center;" |[[Sandstone]] is formed from rounded [[Grain (Rock)|grains]] of sand. | ||
| + | |} | ||
Revision as of 09:52, 3 October 2018
Contents
Key Stage 3
Meaning
A sedimentary rock is one made from layers of sediment that have been deposited at the bottom of a river, lake or sea bed.
About Sedimentary Rocks
- Sedimentary rocks are usually soft compared to other rocks.
- They are made of rounded grains held together by mineral salts.
Formation of Sedimentary Rocks
- Weathering - Rocks are broken down by the environment.
- Erosion - Wearing away rocks into smaller pieces.
- Transport - Small pieces of rock are moved by rivers, glaciers and the wind.
- Deposition - When water and the wind slow down or when glaciers melt the small pieces of rock fall to the ground.
- Sedimentation - Layers of sediment (small pieces of rock) build up on lake beds and sea beds.
- Compaction - So many layers build up that the pressure squeezes all the water out.
- Cementation - Mineral salts that were dissolved in the water fall out of solution and bind the sediment together.
Examples
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| Mudstone is formed from mud. | Limestone is formed from the shells of dead sea creatures. | Sandstone is formed from rounded grains of sand. |