**PLEASE ANSWER ASAP**
Which of the following statements about Earth's atmosphere is true?

a) The atmosphere exerts greater downward than upward pressure.

b) Pressure is highest in upper areas of the atmosphere.

c) Atmospheric pressure increases as altitude decreases.

d) Pressure is equal at all levels of the atmosphere.

A

Explanation:

Air lower in the atmosphere is more dense than air above, so air pressure down low is greater than air pressure higher up. (Remember those acrobats; there's a lot more pressure on the one on bottom than on the one on top.) Temperature also makes changes in air pressure.

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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~ trueboss72

the answer is true. hope it .