If granite and marble were exposed in an area with a hot and humid climate, a. the marble would weather more rapidly b. the rocks would weather at the same rate c. the granite would weather more rapidly

Rock weathering by hot and humid climate is dependent on the rock's strength and hardness. Marble is weaker and softer than Granite. So A. the marble would weather more rapidly.

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.