Chunk of Soil (IMAGE) American Society of Agronomy Caption This chunk of soil has numerous vesicular pores, which are spherical and look a bit like bubbles. Credit Judith Turk Usage Restrictions For use with this story only 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.