Classifying Rocks 3 rock types Sedimentary Igneous Metamorphic

Sediment Rock fragments, minerals, or plant and animal remains that settle out of water or air

Sedimentary Rocks “that which has settled” Formed from sediments Sediments=rocks exposed to weather that have been broken down into very small pieces Formation depends on weathering/erosion Sediments packed into layers Cement together over time

Sedimentary

Sediments change into Rock by  Pressure  Cemented together by new minerals to form rock

Coal Sedimentary rock formed from remains of plants, bark roots, and other plant material that is buried and under pressure Contains NO minerals

Conglomerate Sedimentary rock with pieces of shells, rocks, minerals or other products that are larger than 2 mm cemented together with minerals.

Limestone Sedimentary rock made of shells and skeletons of ocean organisms. Over time the individual shells are no longer visible and become limestone

Sedimentary Rock and Wind Water movement: Larger sediment drops before smaller sediment Wind Direction : Cross- beds, Ripples, Mud Cracks

Challenge Refer to book… What is the difference between compaction and cementation? Compaction occurs when sediment is squeezed together by the weight of other sediment above it, and cementation occurs when sediment is cemented together by dissolved minerals. How do chemical and biochemical sedimentary rocks form? Chemical sedimentary rocks form when minerals crystallize out of solution in water, and biochemical sedimentary rocks form from the action of organisms in water.