Answer:
Deltas are wetlands that form as rivers empty their water and sediment into another body of water, such as an ocean, lake, or another river. Although very uncommon, deltas can also empty into land. A river moves more slowly as it nears its mouth, or end.
Explanation:
The three main forces that cause erosion are water, wind, and ice. Water is the main cause of erosion on Earth.
<span>the answer is physical boundary</span>
