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.
Lesson Summary. The nitrogen cycle is the process in which nitrogen atoms are moved and changed in the environment. It is composed of four basic steps: nitrogen fixation, nitrification, ammonification, and denitrification. During nitrogen fixation, nitrogen gas from the air is converted into ammonium. During nitrification, ammonium is converted into nitrates which are taken up by plants. The nitrates are used by the plants and animals, then returned to ammonium using ammonification. Lastly, nitrogen is returned back to the atmosphere using denitrification. To unlock this lesson you must be a Study.com Member.