There are a selection of geology tutorials from introductory to advanced levels covering a range of topics which together form a free online textbook.

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Below is the abstract of an example tutorial.

Submarine Mass Movement

Submarine mass movement processes, driven by gravitational forces, represent an important mechanism whereby vast amounts of sediment are rapidly transported downslope and redistributed into deep-water from an originally shallow-water setting, and their deposits are widely recognised in continental margins. Although there is a tendency to consider these processes independently, there is an increasing awareness that in many cases these processes need to be integrated to produce a model of margin development. The mass movement processes display large temporal and spatial variations and have different importance, but their interrelationship needs to be understood and background sedimentation processes must be considered. Increasing knowledge of mass movement processes on the continental slope also has interest for natural hazard assessment.

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