Using the atomic masses and relative abundance of the isotopes of nitrogen given below, determine the average atomic mass of nitrogen.
n-14: 14.003 amu; 99.63%
n-15: 15.000 amu; 0.37%

a)14.003 amu

b)14.007 amu

c)14.506 amu

d)15.000 amu

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).

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