Answer:
Having constant size.
Explanation:
Seafloor spreading creates new ocean floor due to the volcanic activities when magma comes out from an active site. The overall size of lithosphere is remain constant because old parts of oceanic plate returns to the mantle when the new ocean floor is formed. Due to increase in spreading of oceanic floor, it will cause in the increase in sea level due to which many islands and coastal regions will sink into the sea.
