Nitrogen form Symbol Use in soils and plants; Dinitrogen (Atmospheric Nitrogen) N 2: Dinitrogen is the most common form. It makes up 78 percent of the atmosphere but cannot be used by plants. It is taken into the soil by bacteria, some algae, lightning, and other means. Nitrate: NO 3: Nitrate is the form of nitrogen most used by plants for growth and development.
Reacting when you hear the tornado sirens go off is key. Emergency officials want reaction to be instinctive, not a frenzy of confusion, when you hear the siren sound. You'll have two chances to practice when the sirens sound today. The first drill will happen between 10 and 10:30 a.m. when children are in school.
If a tornado warning is issued, it means that a tornado has actually been spotted, or is strongly indicated on radar, and it is time to go to a safe shelter immediately. Be alert to what is happening outside as well. Here are some of the things that people describe when they tell about a tornado experience: 1  A sickly greenish or greenish black color to the sky. 2  If there is a watch or warning posted, then the fall of hail should be considered as a real danger sign.