By: Jody and Dustin

Sedimentary Rocks

What are Sedimentary Rocks?• Sedimentary rocks form at the earth’s surface by the lithification of sediments deposited from their transporting.

• Typically rocks that are formed from sediment deposited from the air or water.

Transporting:• When material is transported downhill.

• Transport agents include: water, wind, ice, and gravity.

Deposition• A geological process by which material is added to a landform or land mass• For example: Wind and water, as well as sediment flowing from gravity, transport previously eroded sediment, causing layers of sediment to build up.

The Rock Cycle• The Rock Cycle are the processes that rocks undergo in the earth’s crust.

How are they formed?There are two ways that sedimentary rocks are formed:

Pressure: • As layer after layer of sediments are deposited, the lower layers are pressed together tightly under the weight of the layers above. Cementing:• Some sediments are glued together by minerals dissolved in water.

Some different types of sedimentary rocks are:

1) Clastic sedimentary rocks2) Chemical sedimentary rocks 3) Organic sedimentary rocks

What are the different types…?

Clastic Rocks• Clastic rocks are the more common type of sediment

rock.• Clastic rocks form from cemented sediment grains

that are fragments of pre-existing rocks.• An example of a clastic rock is Sandstone:

Chemical Sedimentary Rocks • Precipitated from an aqueous environment.• Either directly by inorganic processes or by the

actions of organisms.• Chemical rocks include carbonates, chert and

evaporates.• An example is limestone:

Organic sedimentary rocks • Accumulate from the remains of organisms.• An example of organic rocks is coal. It forms from the

compression of plant remains.

Websites Used• http://gwydir.demon.co.uk/jo/minerals/pix/sandstone1.jpg

•http://wiki.answers.com/Q/What_is_an_example_of_a_clastic_sedimentary_rock

• http://legacy.belmont.sd62.bc.ca/teacher/geology12/photos/erosion-water/deposition-sediments.jpg

• http://2.bp.blogspot.com/-q-gBQyZPyeA/ThpObt3pbKI/AAAAAAAAAMI/wTgMYx0FMxQ/s1600/sediments.jpeg

• http://www.fi.edu/fellows/fellow1/oct98/graphics/SEDIANIM.GIF

• http://www.teachnet-lab.org/ps101/bglasgold/rocks/METAANIM.GIF