Recreate the water cycle in the comfort of your own home: Fill a glass with warm water. Fill a second glass with cold water, and add a few ice cubes.
A. What does the outside of the glass with ice cubes feel like?
B. What caused this change?
C. Why didn't the same thing happen to the glass filled with warm water?

well the answer is 2!

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.