Q: Read poem below and answer the question



THE RIVER


The River's a wanderer, 
A nomad, a tramp, 
He doesn't choose one place 
To set his camp. 
The River's a winder, 
Through valley and hill 
He twists and he turns, 
He just cannot be still. 
The River's a hoarder, 
And he buries down deep 
Those little treasures 
That he wants to keep. 
The River's a baby, 
He gurgles and hums, 
And sounds like he's happily 
Sucking his thumbs. 
The River's a singer, 
As he dances along, 
The countryside echoes 
The notes of his song. 
The River's a monster 
Hungry and vexed, 
He's gobbled up trees 
And he'll swallow you next. 

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Why is the river described as a hoarder?


P/s: Please come and see Pn. Mellissa for the answer. ;)