Question

Which statement(s) is/are true?
a. Slow spreading centers tend to have developed rift valleys; fast spreading centers often lack rift valleys.
b. Slow spreading centers are often characterized by a central swell; fast spreading centers have no such swell.
c. Fast spreading centers have prominent ridges and rugged topography; slow spreading centers have rather smooth topographies.
d. Slow spreading centers have prominent ridges and rugged topography; fast spreading centers have rather smooth topographies.
e. Fast spreading centers tend to have developed rift valleys; slow spreading centers often lack rift valleys.

Answer 1

Answer: Option (A) and (C)

Explanation: In case of slow sea floor spreading, the magma within the crust doesn't get proper way to exert the force upward because of its slower rate of spreading. Due to this, rifting occurs along the mid oceanic ridge.

Due to continuous rifting, it forms a valley known as the rift valley. This rift valley lacks in ridge and is comparatively smooth compared to a fast spreading sea floor, in which the topography appears to be rough and ridges are formed.

Thus, the statements that are true are option (A) and (C).