Cave comparison (IMAGE) Geological Society of America Caption On the left side: Under a grey February sky, the mouth of a grey limestone cave (Cliff Cave) is blocked off by wooden slats, which you can partially see through, and ruins of an old stone wall. Leaves litter the ground, the trees are bare, and dark green moss drapes rocks. A small, clear stream runs over the ground. On the right side: The same cave in August, with brown, sediment-laden water rushing from the mouth and flowing over the ground. Credit Teresa Baraza Piazuelo Usage Restrictions Credit Teresa Baraza Piazuelo License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.