What means land masses?explain

A landmass, or land mass, is a large area of land. The term is often used to refer to lands surrounded by an ocean or sea, such as a continent or large island. In the field of Geology a landmass is a defined section of continental crust extending above sea level.

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i think it is true in my reasonment ..

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.