It's mostly because the materials used when building the Pyramids of Egypt were stone, whereas the materials used during the building of the Ziggurats of Mesopotamia were mud bricks.
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So, the Speaker of the House of Representatives usually assign a bill to a committee. And they are responsible for it too.
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The Urban Areas were used to house these Immigrants and they grew larger.
As for the rivers, the colonists were aware you must have water to successfully maintain life whether it be human life or plant life, it is necessary. Also being close to water helped them in the workforce, like carrying out trade or fishing It was a "win win" for them.