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:
A diverging plate boundary on the ocean-floor is marked by the crest of the mid-oceanic ridge. The lithospheric plates diverge at the crest of the mid-oceanic ridge. Since new material is continuously added to the rear of each plate, they do not separate even though their motion is away from each other.