The Grand Prismatic Hot Spring (also known as the Grand Rainbow Hot Spring) located in Yellowstone National Park is the largest hot spring in the United States and the third largest in the world. The beauty of the Grand Prismatic Hot Spring is that the color of the lake changes with the season. In spring, the lake surface changes from green to brilliant Orange-red, this is due to microorganisms such as algae and pigment-containing bacteria living in mineral-rich waters. The ratio of chlorophyll and carotenoids in their bodies will change with the seasons, so the water bodies will appear different. color. According to this text, the reason for the color change of the Grand Prismatic Hot Spring Lake is (). ['Changes in algae and pigmented microorganisms.', 'Changes in the ratio of chlorophyll and carotenoids in water.', 'Microbes such as algae and pigment-containing bacteria live in water.', 'Minerals are rich in water.']