Not too easy. Not too difficult.
I would recommend this class because it is truly interesting. I would not recommend the online course, however. The class is lecture heavy and finding time to watch lectures independently can be difficult at times. Quizzes are straight forward and sometimes he will ask questions during lecture which are on the quizzes. All information on his exams are in his lectures, however, the book is still a good resource.
Lecture heavy quizzing and testing. A lot of references to external resources which do help with grasping concepts. I have learned that dirt is more than just... dirt. It is a living, breathing organism.
Hours per week:
Advice for students:
You need to make time to review the lecture material. There are weekly quizzes which are pretty much pulled directly from his powerpoint lectures. Just looking at the powerpoints is not enough as he speaks on every topic presented and not everything is written out.