The average atomic mass of lithium is 6.94 amu. Based on the atomic masses of the two isotopes of lithium, how do the relative abundances of the
isotopes compare?
A. Li-7 is much more abundant than Li-6.
B. Li-7 is slightly more abundant than Li-6.
C. They are about the same.
D. Li-6 is much more abundant than Li-7.

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

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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explanation:

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