Question

q9 use the data from the table to choose the statement that best supports the concept that new ocean floor is forming constantly along the east pacific rise. (6 points) a rock age is the same at any point along the ridge. b rock age increases as distance from the ridge increases. c rock age decreases as distance from the ridge increases d rock age is the same both at the ridge and many kilometers from the ridge

Explanation:

To determine the correct statement, we recall the concept of seafloor spreading. At mid - ocean ridges (like the East Pacific Rise), new oceanic crust is formed as magma rises and solidifies. As the new crust forms at the ridge, older crust is pushed away from the ridge. So, the age of the oceanic rock should increase as the distance from the ridge (where new crust is formed) increases.

• Option A: If rock age was the same at any point along the ridge, it would not support the idea of new crust forming constantly (since new crust should be younger at the ridge). So, A is incorrect.
• Option B: This option is consistent with seafloor spreading. New crust is formed at the ridge (younger age), and as we move away from the ridge, the crust is older (age increases with distance). So, B is correct.
• Option C: If rock age decreased with distance from the ridge, it would imply that crust gets younger as we move away from the ridge, which is the opposite of what happens in seafloor spreading. So, C is incorrect.
• Option D: If rock age was the same at the ridge and far from the ridge, it would not support the idea of new crust forming at the ridge (since new crust should be younger at the ridge). So, D is incorrect.

Answer:

B. Rock age increases as distance from the ridge increases