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Like I mentioned before, sea-floor spreading is a process in wich new crust is created and older one is destroyed.
This help make a balance so Earth stay its size.
In the photo under this paragraph you can see the sea-floor spreading process. Convection currents in the Earth's interior
make lithosphere to move (like if it was floting) in a way that magma goes up to the sea by one side, and goes down back to
the interior of the Earth by the other. When magma goes up to the sea (by the mid-oceanic ridges), water cools it down and
convert it into new floor. This new floor pushes the older one far away from the ridge. When it reaches the trenches, it goes
back to the interior of the Earth, were it heats up and liquify. This process is called subduction, and where it occurs
is the subduction zone. This process begins and finishes over and over again without end. For this process
is needed a lot of presure and energy that is obtained from the Earth's interior ( from the middle of it in the core).
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