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.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.