The magma that rises out of them cools eventually, with some help from the water. eventually all the cooled magma builds up into an island.
The answer to this question is the Indus River. Hope that I could help!
DescriptionIguazú Falls or Iguaçu Falls are waterfalls of the Iguazu River on the border of the Argentine province of Misiones and the Brazilian state of Paraná. Together, they make up the largest waterfall system in the world. The falls divide the river into the upper and lower Iguazu.
