made when shells settle to the ocean floor when they die mixed with precipitation

(a)  

carbon interacts with living organisms

(a)  

rapid chemical combination of a substance with oxygen involving the production of heat and light

(a)  

carbon interacts with the rock cycle

(a)  

microscopic marine plants as carbon to make shells of CaC03

(a)  

when a plant or animal dies or leaves waste products, decomposers like fungi and bacteria turn N2 back into ammonia

(a)  

these are added back to the ground by rainwater

(a)  

lives in root nodules of pulse family plants

(a)  

energy from lightning breaks N2 molecules apart

(a)  

produced when plants take up NH4

(a)  

converts nitrates (NO3) in the soil to N2

(a)  

highly speacialized bacteria lives in soil and combines N2 with H2

(a)  

when enough water has condensed inside a cloud the droplets become heavy enough to fall as precipitation

(a)  

the process of a solid (snow or ice) vaporizing 

into the atmosphere without first melting into water.Solid → Gas

(a)  

water is warmed by suns solar energy liquid to gas

(a)  

water movement from soil to atmosphere

(a)  

some precipitation runs downhill due to gravity

(a)  

any form of water falling to earths surface

(a)  

the process of water soaking into the ground

(a)