https://padlet.com/kievmoramoodle/821qdezqsmfy56b3 en-us 2022-12-13 05:55:56 UTC 2022-12-13 05:56:56 UTC hello@padlet.com kievmoramoodle https://padlet.com/kievmoramoodle/821qdezqsmfy56b3/wish/2418761291 Seafloor spreading is one of the theories behind the plate movement. It was proposed by the American geophysicist Harry H. Hess in 1960 based on Tharp’s discovery and is said to be the movement of oceanic plates away from each other. It is caused by the heat from the mantle's convection currents making the crust more plastic and less dense causing less dense materials to rise and the formation of new oceanic crust.]]> 2022-12-13 05:56:46 UTC https://padlet.com/kievmoramoodle/821qdezqsmfy56b3/wish/2418761291