Consider the following: If the Earth's Crust are constantly moving, what
will eventually happen to the continents millions of years from now?

the shape of the continents will continue to change, without even accounting for rising sea levels

Explanation:

d.) circle motion requires a force to give it a centripetal acceleration.

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.