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Where do sedimentary rocks originate?

How are they formed?

What are the three categories of sedimentary rocks?

What are the distinguishing characteristics between the three categories of rocks?

  • SCIENCE . -

    (Broken Link Removed)

  • SCIENCE .(this correct) -

    What are the three categories of sedimentary rocks?

    clastic rock formed from fragments broken off from parent rock, by
    o weathering in situ or
    o erosion by water, ice or wind
    followed by transportation of sediments, to the place of deposition;
    biogenic activity; or
    precipitation from solution.
    The sediments are then compacted and converted to rock by the process of lithification

  • SCIENCE . -

    This is from the second link above:

    "There are three basic types of sedimentary rocks:

    1) clastic sedimentary rocks such as breccia, conglomerate, sandstone and shale, that are formed from mechanical weathering debris;

    2) chemical sedimentary rocks such as rock salt and some limestones, that form when dissolved materials precipitate from solution; and,

    3) organic sedimentary rocks such as coal and some limestones which form from the accumulation of plant or animal debris."

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