[1끊어읽기] TOEFL Reading : Seagrasses 2  

The slowing of wave action and currents means 

that seagrass beds tend to accumulate sediment.

However, 

this is not universal 

and depends 

on the currents 

under which the bed exists.

Seagrass beds 

under the influence of strong currents 

tend to have many of the lighter particles, 

including seagrass debris, 

moved out, 

whereas beds 

in weak current areas 

accumulate lighter detrital material. 

It is interesting 

that temperate seagrass beds accumulate sediments 

from sources outside the beds, 

whereas tropical seagrass beds 

derive most of their sediments from within.