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:
The sea floor spreads apart at divergent boundaries. In the ocean, divergent boundaries are also called spreading centers.Mid-ocean ridges mark these sites where the ocean floor is spreadingapart. As the ridges continue to widen, a gap called a forms. Here molten material rises to build new crust.he records are the same on either side of the ridge.As scientists continued to map the ocean floor, they found morerecords of these reversals. By dating the rock, scientists had furtherevidence of plate movement. The youngest rock records the mostrecent reversal, which happened only about 760,000 years ago.