<prompt> Translate the following text to EnglishKwa sababu ya kuwa ni kisiwa cha volkano, si jambo la kushangaza kwamba mchanga wa kisiwa hicho ni mweusi, na nyakati nyingine hata sehemu hiyo huondolewa na maji.  <response>: Not surprisingly for a volcanic island, the sand here is black, and even this stretch is sometimes washed away. 