Today, after our usual breakfast at Imelda's, we had some free time until 3 pm when we had a lecture on geology. During our free time, some of us went to the beach and read, tanned, and played cards, while others did some of our community service hours in the kayak doing bay patrol. Bay patrol involves kayaking or snorkeling around the bay and making sure that tourists don't disturb the turtles or touch the coral reefs.
After our free time, a geology professor from Cancun came to tell us about the geologic origins of the Yucatan peninsula. He taught us about the disappearance of the dinosaurs which is speculated to have been caused by a chondritic meteorite crashing into the Earth and causing a crater to form with a diameter of approximately 10 km. We learned that the crater shape is determined by the kinetic energy of impact which melts the Earth's surface into a liquid around the impact site and then hardens into the shape seen today. Based on deep soil samples, geologists estimate that the impact occurred during the period of time known as the K-T (Cretaceous-Tertiary) boundary around 65 million years ago. The following is a picture of the impact crater:
After our lecture, we went to dinner at a local restaurant run by a Mexican family near our grocery store, and then we had a talking circle on the beach to reflect on our day.
The source of the picture is: www.geocities.com