The Rock Cycle
http://www.projectgcse.co.uk/chemistry/index.htm
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.
http://www.projectgcse.co.uk/chemistry/weathering.htm
Look here for information about weathering of rocks.
http://www.cotf.edu/ete/modules/msese/earthsysflr/rock.html
At this site click on Earth floor. A fun site with explanations and
diagrams.
Crude Oil, Coal and Natural Gas
www.gcsechemistry.co.uk
Have a look at products from oil
Distillation
Some good pictures of fractional distillation. Quite a detailed site.
Revision guides can be tried at;
www.projectgcse.co.uk