I showed up to the interview dressed to the nines, post double shot latte, and mentally prepped only to be ushered to a hallway lined with chairs and a dozen other potential applicants already waiting their turn. I knew I needed something to make me stand out if I had any chance of securing the job.
Answer 1: At plate boundaries where sea-floor spreading occurs, magma wells up to fill the space created by the plates that are moving apart. Check out this United States Geologic Survey (USGS) educational animation to see visually how it works:
It is called the Abyssal Plain. Sea floor spreading occurs here, which means that there is volcanic action and a mid-ocean ridge where some of the lava has cooled. There are also isolated volcanic mountains called sea mounts, and some black smokers, but most of this area is flat and featureless.