Question

What causes seafloor spreading, subduction, and the movement of
tectonic plates?

Answer 1

Subduction happens where tectonic plates crash into each other instead of spreading apart. At subduction zones, the edge of the denser plate subducts, or slides, beneath the less-dense one. The denser lithospheric material then melts back into the Earth's mantle. Seafloor spreading creates new crust.

Step-by-step explanation:

hope it helps i do not know if that is the kind of answer you wanted or not but i tried