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:
Youngest rock on the ocean floor can be seen in divergent plate boundaries and hot spots. Tectonic plates are moving continuously. When two plates diverge to each other volcanic material erupt in the boundry. This liquid magma cools down and become solid magmatic rock. Such areas are called divergent boundary. If these two boundries are beneath an ocean than cooling process become faster. Such areas are called seafloor spreading. Atlantic mid oceanic ridge is the longest divergent boundary. Iceland is formed because of this process! Hot spots are also host the youngest rocks on Earth. Hawaii Islands are the well known examples of hot spots.