darkness they rely on currents to deliver tiny particles of food for them to absorb and often in. those particles are plankton which drift like snowflakes through the oceans the supply at those depths is meager so cold water corals grow slowly not more than fifteen metres in the flowers and years. still the team have discovered. donnish in coral formations. the aphelion found very many reefs especially in the atlantic with coral mounds some more than three hundred meters tall. that's as tall as the eiffel tower all the t.v. tower and violins that's really big. absolut say you believe in to find out more about how the reef may mauritania developed cloudy i've been back and her colleagues collected samples of fossil coral from different layers they