Sedimentary Rocks

From Sediment to Rock.

• sediment is small, solid pieces of material that come from rocks or living 
• Most sedimentary rocks are formed through a series of processes: 
• erosion, Deposition, compaction, cementation.
• erosion: particles carried away by water, or wind.
• Deposition: particles deposited as loosely packed sediement

FROM SEDIMENT TO ROCK cont....

• Compaction: particles squeezed together under pressure
• Cementation: particles glued together as solutions harden.  

Types of Sedimentary rocks

• 3 types of sedimentary rocks.
• Clastic, organic, chemical rocks.
• clastic formed when fragments squeezed together
• organic forms when remains are deposited in think layers.
• Chemical forms when minerals dissolved in a crystallize.

uSE OF SEDIMENTARY ROCKS

• SANDSTONES AND LIMESTONE ARE USED IN BUILDINGS.
• THEY ARE SOFT ENOUGH TO CUT EASILY INTO SLABS.
• BUILDERS USE SANDSTONE AND LIMESTONE ON WALLS ON BUILDINGS 
• LIMESTONE IS USED IN MAKING STEEL AND CEMENT.