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.
Areas with mountains is the answer
Deposition has to do with deltas because when deposition such as water wind or ice moves the sediments and deposits them at the end of a river lake or ocean a delta is formed
Im not really good with essays,but i can give you an idea.
I think the best way to learn things is to find an interest in it and continue doing some research on it until you have a good understanding of it.Thing like a new sport or experiment
