Answer:
A landmass formed within a river is known as riverine islands. Riverine islands are formed when rocks and mud gets deposited in the river bed by flowing rivers.
Answer:
It would affect all organisms on the planet and the food cycle would be ruined.
Answer:
Volcanic islands are formed as a crustal tectonic plate containing an ocean moves over a magma hot spot.
... This magma carries an enormous amount of heat, and it can then be released into the crust and createmagma chambers there.
Agriculture availibilty is profound in these areas as fields for agriculture is great for farmers. Spices and vegetables can be grown very well.