Final answer:
Scientists support the theory of sea-floor spreading using evidence from magnetic stripes, the age of oceanic rocks, and the fossil record, which collectively point to the formation of new crust at mid-ocean ridges and the lateral movement of the sea floor.
Step-by-step explanation:
Scientists have found three kinds of evidence to support the theory of sea-floor spreading, which is a pivotal concept in the understanding of plate tectonics. Sea-floor spreading refers to the process by which new oceanic crust is formed at mid-ocean ridges and slowly moves away from the ridge, giving insight into the dynamic nature of the Earth's surface.
Additional research, such as examining seismic surveys and the creation of geological features like the Hawaiian island chain, has further validated the theory of sea-floor spreading and its implications for our understanding of plate tectonics.