Harappan seals have shown connections to the Mesopotamian civilization. The seals date between 1872-73 CE. The structure of the seals are similar to that of the Mesopotamian civilization and provide evidence for the trade existing between the two civilizations.
Relationship between the portion of earth being studied and the earth as a whole is known as scale.
Thomas Savery's steam<span> pump. The industrial use of </span>steam<span> power started with Thomas Savery in 1698. He constructed and patented in London the first </span>engine<span>, which he called the "Miner's Friend" since he intended it to pump water from mines.</span>
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