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14 Cards in this Set

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What percent of exposed rocks are sedimentary
75%
Pricipal of Original Horizontality
Sedimentary rocks form horizontal layers or bands
Superposition
another concept by JAmes hutton it states that younger rocks are on the top while the farther down you go the older the rocks get
Weathering and erosion
water, air,a nd ice can break down into smaller particles. Erosion moves these smaller particles to locations where they accumulate
compacting
sediments accumlate and form layers Pressure builds up from above layers.
Lithificaton
involving compacting or cerementation is the process os sediments becoming sedimentary rocks.
Organic Sedimentary Rocks?
Organic Sedimentary Rocks: formed from material that was once living
Qualificaitons of Detrial rocks
Conglomerite of Breccia: pebble or gravel that has been cemented together. Sharp angles is breccia
The three other types of Detrail rocks.
Sandstone: Made of small, sand-sized grains
Siltstones: Made of small hand sized particles which are smaller then grains of sand
Clay-sized of Shale: clay sized particles even smaller then siltsized particles
Examples of Chemical rocks
Limestone and rocksalt
Examples of organic sedimentary rocks
Limestone forms from organic fosilized shells
Coal is an example of an organic sedimentary rock. Created when dead plants are buried under other sediments in swamps
chemical sedimentary rocks
Chemical rock: are made of solutions which have minerals dissolved in them.Lake dissolves leaving mineral deposits
detrail
Detrail: actually clastic made of previously existing rock broken down into catagories based on size of particles they consist of.
cementation
water picks up disovled materials and moves thorugh soil and rock when with quartz or calcite it can act as a glue or cement to hold large rock particles together.