Difference between revisions of "Sedimentary"

Revision as of 12:09, 4 April 2019

A sedimentary rock is one made from layers of sediment that have been deposited at the bottom of a river, lake or sea bed.

Sedimentary rocks are usually soft compared to other rocks.

They are made of rounded grains held together by mineral salts.

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.


Mudstone is formed from mud.	Limestone is formed from the shells of dead sea creatures.	Sandstone is formed from rounded grains of sand.

@@ Line 4: / Line 4: @@
 ===About Sedimentary Rocks===
-: [[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.