Housen Magpart (2 of 2) (IMAGE) Geological Society of America Caption This photo, taken with a scanning electron microscope, shows several small magnetic particles from pollution -- such as iron oxides from diesel exhaust -- on a (wavy) leaf. Credit Sadie Belica, Western Washington University Geology Department Usage Restrictions non-commercial and educational 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.