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Seafloor Spreading and Magnetic Reversal The idea of continental drift circulated in scientific circles until World War II, when sounding gear called SONAR produced new evidence of what the seafloor ooked like. The gear, developed in the 1930s, bounced sound waves off the seafloor o determine its depth and features. SONAR beam to navigate and map out the seafloor​

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Seafloor spreading is a geologic process in which tectonic plates—large slabs of Earth's lithosphere—split apart from each other.

 

Seafloor spreading and other tectonic activity processes are the result of mantle convection. Mantle convection is the slow, churning motion of Earth’s mantle. Convection currents carry heat from the lower mantle and core to the lithosphere. Convection currents also “recycle” lithospheric materials back to the mantle.

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