1 Nearly one-fifth (19%) of juvenile violent crimes occur in the 4 hours between 3 p.m. and 7 p.m. on school days. 2  A smaller proportion of juvenile violent crime (15%) occurs during the standard juvenile curfew hours of 10 p.m. to 6 a.m. (inclusive of both school and nonschool days).
Cause. Sooty mold is a fungal disease initiated by a combination of feeding insects, such as whiteflies and aphids, and fungi. Insects feed on the gardenia for the sap in the foliage and stems. The insects take in large amounts of sap and expel the leftover as a sticky liquid called honeydew.
Understand the cause of silver tarnish. Tarnish develops as a chemical reaction. The most common source is through the air (although direct contact with substances that contain sulfur will also cause tarnish). This is why silver is generally stored in air-restricted spaces.