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The information inscribed on a clay tablet could easily be changed by wetting the clay and rewriting on it. Clay envelopes sealed with an official clay seal, kept the documents safe.

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They mastered the technology of irrigation. They built not only canals but underground aqueducts. They also built levees, or raised banks, along the rivers to protect against damage floods.

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After the clay baked hard in the sun, the potter might paint a basic geometric design, human figure, or an abstract pattern of dots and strokes on it.