Which of these statements about Earths crust is true A:it includes the continents and ocean floor B: it includes the continents and the ocean floor. C:it is a changing moving surface with the same thickness everywhere. D: it is a layer of solid rock that remains the same throughout the time

output?

explanation:

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

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i think   the answer is c hope i'm right