Seafloor Spreading

a device that bounces sound waves off underwater objects and then records the echoes of these sound waves,

in the seafloor was normal at mid- ocean ridges but reversed in symmetrical patterns away from the ridge center. This normal and reversed pattern continues across the seafloor.

that were attached to ships scientists discovered a lot about the magnetic properties of the seafloor.

seafloor has different features

This crust eventually subducts at the deep ocean and melts back into the mantle

the magma moves up from the mantle and erupts as pillow lava. This forms new

He explained how the convection currents in the Earth’s interior makes the seafloor spread.

The following are three evidence that support the idea that seafloor is continuously spreading.

rocks shaped like pillows (rock pillows) show that molten materials have erupted again and again from cracks along the midocean ridge and cooled quickly

strip-rocks that make up the ocean floor lie in a pattern of magnetized stripes which hold a record of the reversals in the magnetic field

core samples from the ocean floor show that older rocks are found farther from the ridge; youngest rocks are in the mid-ocean ridge

carries heat from the molten materials in the mantle and core towards the lithosphere.