What process in earth's interior causes subduction and seafloor spreading

also srry if it is not in the correct subject!

The 5th term in a series of even number that begin 3x

What is the northern most national park in the world

Which evidence is most likely used to indicate the beginning of solar system formation? a. materials combined to form a mass. b. materials were pulled together by gravity. c. water condensed and collected to form oceans. d. different species of microorganisms lived on earth.