The Rock Cycle

    At this site click on chemistry and then on one of the following;
    Continental drift.
    Structure of the Earth.
    Erosion and transportation.
    Igneous rocks.
    Sedimentary rocks.
    The rock cycle.
    Plate tectonics.
    Rock weathering
    This site is short and to the point with straight definitions and text.

    Look here for information about weathering of rocks.

    At this site click on Earth floor. A fun site with explanations and diagrams.

    Crude Oil, Coal and Natural Gas

    Have a look at products from oil

  • Distillation
    Some good pictures of fractional distillation. Quite a detailed site.

    Revision guides can be tried at;