Another textbook illustration - 3 and a half hours to do. This one on avalanche debris from a landslide. This is for the same geology textbook - I know, not a sexy, science fiction block buster - but it pays the bills! And actually these are fun and challenging to do. There has to be a lot of information in these block illustrations - but they also have to read fast and be very easy to understand what's happening so as to not lose the reader.