I took this course merely out of interest (I'm a graduate student in ECE major and this course would not be accounted for my capstone requirement). And this course turned out to be an interesting experience for me at UCLA.
To be honest, I do recommend reading the textbook carefully if you have completely no idea or only a general impression about natural disasters before this course. Though professor Moon said that the textbook could be digitally available on Amazon, the price was relatively high (I remembered it was about $70). You could try to find the digital textbook on other websites with unbelievable price (only $18).
To make sure about the participation, this course requires a Clicker+ or Clicker 2 (Don't forget to register them on CCLE). You need to prepare for answering several questions brought by the professor during the class, but you don't need to be correct - the correctness would not impact your participation score. You need to answer at least a half of the questions to earn the participation score for that class.
Quizzes and discussions are easy. For quizzes, it was done online with 10 multiple choice questions, and you can use your textbook or just Google for the answer. Just remember that the quizzes would be released after the first lecture during the week, and you have to finish it before the second lecture in the same week. The discussions are mandatory since several discussion questions would be provided, and you need to hand in your answer after the discussion.
Since I had some knowledge about several natural disasters even before this course (especially about earthquake and volcano), the midterm was relatively easy for me. However, I would say some of the questions would be challenging for some students who take this course for the first time, because these questions asked knowledge that you could easily ignore in the slide presentations. (e.g. One question asked if there was a caldera eruption in California within one million years from now, and the answer was "correct". I went to ask Prof. Moon about this, and she looked up Wikipedia, USGS Volcano Monitoring System and finally found that the last eruption did happen in the last one million year - and it was written on one page of slide with a brief comment.)
The final was somehow challenging if you couldn't review the textbook and slides carefully. 70% of the exam questions were about the disasters from the flooding, with 30% about the disasters before the midterm. Most questions were multiple choice questions, with others requiring answers with several sentences.
Prof. Mckeegan and Prof. Moon are great. They tried to deliver the most important knowledge via slides, which were also well-organized based on the textbook. In addition, sometimes they could get a sense of humor and make you laugh.
I do recommend this course if you have an interest in this course. Though the capacity of the course could be a little bit large, it would be okay if you could review the slides and textbook carefully.

Interesting course material. When I took this, it was taught with Professor Moon as well, but I couldn't find her here so I'll just do one review for both.
It's a pretty easy science GE with a bonus diversity fulfillment, if you're good at memorization.

- Lectures were fairly interesting, but kinda stressful if you want to take notes since they go fast (slides posted online later).
- Both profs are nice and pretty helpful during office hours.
- Attendance is counted in both section and lecture, so you do have to show up at least half the time.
- The homework (drop 1) was easy, but the final report (1-2) is a little annoying.
- Weekly quizzes (drop 1) weren't too bad if you read the textbook/can google quickly
- Exams (1 midterm and final) were mostly multiple choice with some free response, and both sections were mainly facts based on the textbook/slides.

Nice class and fun professors overall. If you take this class, be prepared to become slightly paranoid about earthquakes afterwards.