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:
floor is sea floor spreading. 27 Evidence for Sea Floor Spreading. In the 1960s scientists found evidence that new material is erupting along the mid-ocean ridge. The presence of pillow shaped rocks has showed that molten material has erupted again and again. 28 Pillow Lava rocks. 29 Evidence for Sea-Floor Spreading 31  32 . In the 1968, scientists aboard the Glomar Challenger gathered information about the Sea floor. They found rocks no older than 180 million years. 33 Evidence of Sea-Floor Spreading. Evidence from drilling into the sea floor shows evidence of the ages of rocks.