Why is the history of any part of the ocean floor important

The history of the ocean floor is important because it can be a tell tale sign of how the plate tectonics are moving. It can show how new the ocean floor through subduction. Divergent and convergent plate boundaries on the ocean floor (which can create trenches and mid ocean-ridges) also show if the plates are pulling apart or coming together along the ocean floor.

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.

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