Answer:
River deltas are important in human civilization, as they are major agricultural production centers and population centers. They can provide coastline defense and can impact drinking water supply. They are also ecologically important, with different species' assemblages depending on their landscape position. As ancient Egypt grew larger and richer, they could build bigger and bigger pyramids because they always had enough food and water. What's more, the Delta was a good place for trade, because they could send goods up the river, or bring in ships from across the entire Mediterranean Sea.