Holiday Weather. Less rain and more sun is the main theme during the third month of the year, and a very popular time to visit Madrid, as the fleeting spring season begins. You can expect an average temperature of around 10Â°C during March, which actually reaches a very pleasant 16Â°C on a good day, and goes down to an average low of 4Â°C in th...
The nitrogen cycle is the process by which nitrogen is converted from organic to inorganic forms; many steps are performed by microbes. Learning Objective. Key Points. Nitrogen is converted from atmospheric nitrogen (N2) into usable forms, such as NO2-, in a process known as fixation.
In the atmosphere, nitrogen is found as N2. This N2 is not usable by most plants and animals. In order for plants and humans to get the nitrogen they need, the nitrogen must be converted into ammonia-NH3. The conversion of this atmospheric nitrogen to the usable form of ammonia is known as nitrogen fixation.