Someone was murdered on a remote island. The body was found on the delta in the southwestern part of the island (see map below). There were only 11 visitors on the island that day, so there are ten suspects. They all said they did not go to that part of the island. For example, one said: "I spent the entire day at the hot spring near the volcano". Luckily, it happened on the first day and they all had some sand on them (e.g. shoes, bags, pockets, beach towel). Sand samples were thus collected from all suspects. You have been hired as a "forensic" sedimentologist (!) to independently match each area of the island (depositional env.) with a sample. This will help investigators verify the alibi of each suspect. Did they really spend the day where they say they were?
 
Your job is to match each area of the island with a sample (scroll down to see the photos). You can zoom and pan by clicking on the images. Another option is to open a larger image in a new tab on your browser (right-click, open in new tab). When ready, start the quiz (new tab), answer the questions, and check your results!

Credit: The sand photos come from a gigapan collection