Plz help im timed :\ By which mechanism does older oceanic rock move at a ridge?

Magnetic forces move the rock.
Continents drift and move the rock.
The ridge subducts and moves the rock.
New molten material rises and moves the rock.

The ridge subducts and moves the rock.

c.  older rocks farther from the ridge

Explanation:

because i know   ;)

ecotourism pay for conservation efforts.

plato users:

d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.