The data form the earth's magnetic fields that are locked inside the earth's surface below and is thus an understood form seafloor spreading and plate tectonics and occurs at the concepts of the plate tectonics and is thus a valid form the viewpoints form the formation of the earth.
The basaltic rocks that are erupted at the seafloor are comprised of magnetic property, where the iron minerals are oriented in the north/south direction. It has been observed that the earth's magnetic polarity alters every time it erupts. This played a key role in determining that the seafloor spreading is taking place and which further provided as key evidence for the proving of the plate tectonic activity. The rocks formed at the mid-oceanic ridge are the youngest, and moving away from it, the age of the rocks increases.
