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.

Meteor Craters

A meteorite is defined as any extraterrestrial solid mass that reaches the Earth's surface (Farris Lapidus, 1990). The term strictly extends from the nano scale e.g. dust particles, through to the macro scale e.g. 100s of metres in diameter (Zanda and Rotaru, 2001). However, the term meteorite is generally reserved for the larger particles that reach the Earth's surface.

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