plants are the largest source of nitrogen on earth.
plants are the largest source of nitrogen on earth.
what is the largest source of nitrogen on earth?
plants
the united states is argentina's fourth-largest export market (mainly energy staples, steel, and wine), and third-largest source of imports (mainly industrial supplies such as chemicals and machinery). argentina itself is a relatively minor trade partner for the united states, its imports from the u.s. of $9.9 billion making up 0.7% of total u.s. exports and its exports to the u.s. of $4.5 billion only 0.2% of u.s. imports; argentina however is among the few nations with which the united states routinely maintains significant merchandise trade surpluses, and the $5.4 billion surplus with argentina in 2011 was the tenth-largest for the u.s. in the world. the u.s. earned a further $4.1 billion surplus in trade in services with argentina in 2011. a record 690,000 argentine nationals visited the united states in 2013, making argentina the 15th largest source of foreign tourism into the u.s.
argentina–united states relations
nitrogen cycle









































the nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere, terrestrial, and marine ecosystems. the conversion of nitrogen can be carried out through both biological and physical processes. important processes in the nitrogen cycle include fixation, ammonification, nitrification, and denitrification. the majority of earth's atmosphere (78%) is atmosphere nitrogen, making it the largest source of nitrogen. however, atmospheric nitrogen has limited availability for biological use, leading to a scarcity of usable nitrogen in many types of ecosystems.
nitrogen cycle