the mountain chains in northern Europe and west Africa match the Appalachain mountains in terms of there ages and the sequences of rock layers that make them up in 3-5 sentences analyze these observations and explain what conclusions can be drawn from them

a low [OH– ] and a high pOH

Explanation:

A solution with high pH will have low concentration and a solution with low pH will have high concentration.

A solution with high pH is more basic  

A solution with low pH is more acidic  

pH and pOH is related by pH + pOH = 14

A solution with high pOH is more acidic  

A solution with low pOH is more basic  

Thus we see pH and pOH are inverse to each other.

So second option a low [OH– ] and a high pOH  is the Answer

That is High []  will be low and this will be high pOH………..Acidic solution.